diff --git a/CHANGELOG.md b/CHANGELOG.md
index 28e3980..976b740 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ One line per change, grouped by the release that shipped it. Newest
 first. A release is a Cargo.toml bump plus a `v<version>` tag; the
 content repos pin the tag they run (see the end of this file).
 
+## Unreleased
+
+- `leaves_after: { minutes: 10 }` on a state: a record that has been there that long leaves its bucket's lists (days, hours and minutes add up; swept every minute; the event log keeps it). Trainer: `leaves_after` per stage on a need. A Klingenberg Bygg card taken off the front page leaves the office's list ten minutes later instead of standing there greyed out.
+
 ## 0.6.6 (2026-09-30)
 
 - `one_per_person: true` on an alternative: each signed-in person keeps one record there, their own. The form opens filled in with it, a file left unchosen keeps the one already there (shown beside the picker), and sending again replaces the card instead of adding one. Two sends at once settle on the newest. Trainer: `one_per_person` on a need entered from inside; Klingenberg Bygg's people each edit their own card on the front page.
diff --git a/docs/state-machines.md b/docs/state-machines.md
index 68c3ff3..67e49bf 100644
--- a/docs/state-machines.md
+++ b/docs/state-machines.md
@@ -116,6 +116,22 @@ the same transition path, fires the same mail, and lands on
 The unit is days and the sweep is hourly. This is a deadline, not a
 job queue.
 
+### leaves_after
+
+```yaml
+      taken_down:
+        event: taken_down
+        leaves_after: { minutes: 10 }
+```
+
+How long a record stays in its bucket's lists once it has entered the
+state, when that is not for ever. A card taken off the front page
+leaves the desk's list ten minutes later instead of standing there
+greyed out, and the ten minutes are the time to see what was just
+done. Days, hours and minutes add up, and a sweep takes records out
+once a minute. Nothing is decided and no mail goes. The record leaves
+the lists, and the event log keeps it.
+
 ## attended_by
 
 ```yaml
diff --git a/plans/klingenbergbygg.yaml b/plans/klingenbergbygg.yaml
index 024aa9d..1613ab9 100644
--- a/plans/klingenbergbygg.yaml
+++ b/plans/klingenbergbygg.yaml
@@ -152,6 +152,8 @@ needs:
     wants: at den som vurderer oss ser hvem som gjør jobben
     enters_as: kontor
     one_per_person: true
+    # Et kort som er tatt ned, forsvinner fra kontorets liste etter ti minutter.
+    leaves_after: { sluttet: { minutes: 10 } }
     lands_in: ansatte
     handled_by: kontor
     watched_by: [public]
diff --git a/src/aggregates/mod.rs b/src/aggregates/mod.rs
index 54b064e..1fda973 100644
--- a/src/aggregates/mod.rs
+++ b/src/aggregates/mod.rs
@@ -51,6 +51,35 @@ pub struct AggregateSchema {
     /// no answer in six weeks has to go on without one, and nothing in
     /// a building is going to press that button.
     pub after_for_state: HashMap<String, AfterSpec>,
+    /// How long a record stays in the list once it has entered a
+    /// state, when that is not for ever: a card taken off the front
+    /// page leaves the desk's list a little later, instead of standing
+    /// there greyed out. The event log keeps it.
+    pub leaves_for_state: HashMap<String, LeavesSpec>,
+}
+
+/// `leaves_after: { minutes: 10 }` on a state: how long a record that
+/// has entered it stays in its bucket's list. Days, hours and minutes
+/// add up; the sweep that takes it out runs every minute.
+#[derive(Clone, Debug, Default, PartialEq, serde::Serialize, serde::Deserialize)]
+#[serde(deny_unknown_fields)]
+pub struct LeavesSpec {
+    #[serde(default, skip_serializing_if = "is_zero")]
+    pub days: u32,
+    #[serde(default, skip_serializing_if = "is_zero")]
+    pub hours: u32,
+    #[serde(default, skip_serializing_if = "is_zero")]
+    pub minutes: u32,
+}
+
+fn is_zero(n: &u32) -> bool {
+    *n == 0
+}
+
+impl LeavesSpec {
+    pub fn millis(&self) -> i64 {
+        ((i64::from(self.days) * 24 + i64::from(self.hours)) * 60 + i64::from(self.minutes)) * 60 * 1000
+    }
 }
 
 /// A mail to send when a record enters a state. `to` is `submitter`
@@ -125,6 +154,8 @@ struct RawState {
     grants: Option<String>,
     #[serde(default)]
     after: Option<AfterSpec>,
+    #[serde(default)]
+    leaves_after: Option<LeavesSpec>,
 }
 
 #[derive(Debug, serde::Deserialize)]
@@ -197,7 +228,14 @@ pub fn parse_aggregates_yaml(raw: &str) -> anyhow::Result<HashMap<String, Aggreg
         let mut mail_for_state = HashMap::new();
         let mut grants_for_state = HashMap::new();
         let mut after_for_state = HashMap::new();
+        let mut leaves_for_state = HashMap::new();
         for (state, raw_state) in raw_schema.states {
+            if let Some(leaves) = raw_state.leaves_after {
+                if leaves.millis() == 0 {
+                    anyhow::bail!("aggregates.yaml: bucket {bucket:?}: state {state:?}: leaves_after needs some days, hours or minutes");
+                }
+                leaves_for_state.insert(state.clone(), leaves);
+            }
             if let Some(group) = raw_state.grants {
                 if group.trim().is_empty() {
                     anyhow::bail!("aggregates.yaml: bucket {bucket:?}: state {state:?}: grants needs a group");
@@ -245,6 +283,7 @@ pub fn parse_aggregates_yaml(raw: &str) -> anyhow::Result<HashMap<String, Aggreg
                 mail_for_state,
                 grants_for_state,
                 after_for_state,
+                leaves_for_state,
             },
         );
     }
diff --git a/src/deadlines.rs b/src/deadlines.rs
index c302ff5..757dad2 100644
--- a/src/deadlines.rs
+++ b/src/deadlines.rs
@@ -37,6 +37,55 @@ pub async fn run(state: AppState) {
     }
 }
 
+/// Records leaving their list: once a record has been in a state with
+/// `leaves_after` for that long, it is taken out of the bucket. Not a
+/// move - nothing is decided, no mail goes - and the event log keeps
+/// the record. Every minute, over the buckets that use it and no
+/// others.
+pub async fn run_leaving(state: AppState) {
+    let mut tick = tokio::time::interval(std::time::Duration::from_secs(60));
+    loop {
+        tick.tick().await;
+        if let Err(e) = sweep_leaving(&state).await {
+            tracing::warn!(error = %e, "leaving sweep failed");
+        }
+    }
+}
+
+/// Whether a record has stayed out its time in the state it is in.
+pub fn has_left(schema: &crate::aggregates::AggregateSchema, answer: &Answer, now_ms: i64) -> bool {
+    schema
+        .leaves_for_state
+        .get(&answer.state)
+        .is_some_and(|leaves| now_ms >= waiting_since(answer) + leaves.millis())
+}
+
+pub async fn sweep_leaving(state: &AppState) -> anyhow::Result<()> {
+    let now_ms = chrono::Utc::now().timestamp_millis();
+    let aggregates = state.aggregates.load();
+    for schema in aggregates.values().filter(|s| !s.leaves_for_state.is_empty()) {
+        let Ok(store) = state.jetstream.get_key_value(&schema.bucket).await else { continue };
+        let keys: Vec<String> = {
+            use futures::TryStreamExt;
+            match store.keys().await {
+                Ok(keys) => keys.try_collect().await.unwrap_or_default(),
+                Err(_) => continue,
+            }
+        };
+        for id in keys {
+            let Ok(Some(bytes)) = store.get(&id).await else { continue };
+            let Ok(answer) = serde_json::from_slice::<Answer>(&bytes) else { continue };
+            if has_left(schema, &answer, now_ms) {
+                match store.delete(&id).await {
+                    Ok(()) => tracing::info!(bucket = %schema.bucket, id, state = %answer.state, "a record left its list"),
+                    Err(e) => tracing::warn!(bucket = %schema.bucket, id, "a record could not leave its list: {e}"),
+                }
+            }
+        }
+    }
+    Ok(())
+}
+
 /// When a record entered the state it is in now. A record nobody has
 /// moved has been waiting since it was sent.
 fn waiting_since(answer: &Answer) -> i64 {
@@ -150,6 +199,21 @@ aggregates:
         }
     }
 
+    #[test]
+    fn a_record_leaves_its_list_when_its_time_in_the_state_is_up() {
+        let s = schema(
+            "aggregates:\n  - bucket: people\n    initial: open\n    states:\n      open: { event: shown }\n      gone: { event: gone, leaves_after: { minutes: 10 } }\n    transitions:\n      open: [gone]\n",
+        );
+        let t = 1_000_000_000_000;
+        let mut answer = waiting("gone", t - 60 * 60 * 1000);
+        answer.decided_ms = Some(t);
+        assert!(!has_left(&s, &answer, t + 9 * 60 * 1000), "measured from entering the state, not from sending");
+        assert!(has_left(&s, &answer, t + 10 * 60 * 1000));
+        // A state without it keeps its records.
+        assert!(!has_left(&s, &waiting("open", 0), t));
+        assert!(crate::aggregates::parse_aggregates_yaml("aggregates:\n  - bucket: p\n    initial: open\n    states:\n      open: { event: o, leaves_after: {} }\n    transitions: {}\n").is_err());
+    }
+
     #[test]
     fn a_deadline_comes_due_the_day_it_says_and_not_before() {
         let s = schema(HEARINGS);
diff --git a/src/main.rs b/src/main.rs
index b344620..a10818b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -132,6 +132,7 @@ async fn serve() -> anyhow::Result<()> {
     // windows (see announce.rs).
     tokio::spawn(portal::announce::run(state.clone()));
     tokio::spawn(portal::deadlines::run(state.clone()));
+    tokio::spawn(portal::deadlines::run_leaving(state.clone()));
     // The accounts the content mandates: the first person in, and
     // everyone a page names as responsible, at start and whenever the
     // content changes (seed.rs).
diff --git a/src/trainer/build.rs b/src/trainer/build.rs
index b4eeb7f..58de4a1 100644
--- a/src/trainer/build.rs
+++ b/src/trainer/build.rs
@@ -440,6 +440,12 @@ pub struct PlanNeed {
     /// own it.
     #[serde(default)]
     pub one_per_person: bool,
+    /// How long a record stays in the lists once it reaches a stage,
+    /// when not for ever: `{ sluttet: { minutes: 10 } }` takes a card
+    /// off the desk's list ten minutes after it came off the front
+    /// page, instead of leaving it there greyed out.
+    #[serde(default)]
+    pub leaves_after: BTreeMap<String, crate::aggregates::LeavesSpec>,
     pub collects: Vec<Field>,
     /// How many required fields this person will tolerate: what the
     /// business said about them, not what the form happens to ask.
@@ -763,6 +769,12 @@ impl Plan {
                     bail!(at(&format!("deadline on {state:?} goes to {:?}, which is not a move the state machine has from there", d.to)));
                 }
             }
+            if let Some(bad) = need.leaves_after.keys().find(|st| !need.stages.contains(st)) {
+                bail!(at(&format!("leaves_after names {bad:?}, which is not one of its stages")));
+            }
+            if need.leaves_after.values().any(|l| l.millis() == 0) {
+                bail!(at("leaves_after needs some days, hours or minutes"));
+            }
             if need.one_per_person && need.enters_as.is_none() {
                 bail!(at("one_per_person keeps a card for each signed-in person, and the need has no enters_as to sign them in"));
             }
@@ -2059,6 +2071,9 @@ pub fn render(plan: &Plan, words: &BTreeMap<String, Value>) -> anyhow::Result<BT
                     if let Some(d) = need.deadlines.get(st) {
                         state["after"] = json!({ "days": d.days, "to": d.to });
                     }
+                    if let Some(leaves) = need.leaves_after.get(st) {
+                        state["leaves_after"] = json!(leaves);
+                    }
                     (st.clone(), state)
                 }).collect::<Map<_, _>>(),
                 "transitions": machine(need),
@@ -2720,7 +2735,7 @@ mod tests {
             stages: v(stages), done_when: v(done), success: v(success), skippable: v(skippable),
             moves_by: BTreeMap::new(), watched_by: vec![],
             events: BTreeMap::new(), attended_by: None, mails: BTreeMap::new(), stages_text: BTreeMap::new(), turned_down_from: vec![], reached_from: BTreeMap::new(), requires: String::new(), followed_by: vec![],
-            grants: BTreeMap::new(), deadlines: BTreeMap::new(), escalate: BTreeMap::new(), public_states: vec![], presents: false, paused: false, one_per_person: false,
+            grants: BTreeMap::new(), deadlines: BTreeMap::new(), escalate: BTreeMap::new(), public_states: vec![], presents: false, paused: false, one_per_person: false, leaves_after: BTreeMap::new(),
             collects: vec![], max_fields: 3,
         }
     }
diff --git a/src/trainer/plan.rs b/src/trainer/plan.rs
index 0f60390..48e0014 100644
--- a/src/trainer/plan.rs
+++ b/src/trainer/plan.rs
@@ -196,6 +196,11 @@ rest. Each is one line in the plan, and the builder does the wiring:
   their own, which the form opens with and which sending again
   replaces - a card on the front page they edit themselves. A picture
   left unchosen stays as it was.
+- **Let finished things go.** `leaves_after: { <stage>: { minutes: 10 } }`
+  takes a record out of every list that long after it reaches that
+  stage (days, hours and minutes add up). A card taken off the front
+  page need not stand greyed out on the desk for ever; the history
+  keeps it.
 - **Pause what you cannot take on.** `paused: true` on a need keeps
   its card on the page, saying what the business does and that it is
   not taking new ones right now, with no form and a button that does