diff --git a/frontend/tests/log.spec.ts b/frontend/tests/log.spec.ts
index f835e84..bc74ec4 100644
--- a/frontend/tests/log.spec.ts
+++ b/frontend/tests/log.spec.ts
@@ -67,6 +67,16 @@ test("Cox can start and finish trip", async ({ page }, testInfo) => {
   await expect(page.getByRole("listbox")).toContainText(
     "Nur 2 Ruderer können hinzugefügt werden",
   );
+
+  // Trip starts 2 hours ago
+  const datetimeSelector = '#departure';
+  const currentValue = await page.$eval(datetimeSelector, el => el.value);
+  const currentDate = new Date(currentValue);
+  currentDate.setMinutes(currentDate.getMinutes());
+  currentDate.setHours(currentDate.getHours() - new Date().getTimezoneOffset()/60 - 2);
+  const newDatetime = currentDate.toISOString().slice(0, 16);
+  await page.$eval(datetimeSelector, (el, value) => el.value = value, newDatetime);
+
   await expect(page.locator("#shipmaster-newrowerjs")).toContainText("cox");
   await expect(page.locator("#steering_person-newrowerjs")).toContainText(
     "rower2 cox",
@@ -80,15 +90,6 @@ test("Cox can start and finish trip", async ({ page }, testInfo) => {
   await page.goto("/log");
   await page.locator("div:nth-child(2) > .border-0").click();
 
-  // Add a minute
-  const datetimeSelector = '#arrivaljs';
-  const currentValue = await page.$eval(datetimeSelector, el => el.value);
-  const currentDate = new Date(currentValue);
-  currentDate.setMinutes(currentDate.getMinutes() + 1);
-  currentDate.setHours(currentDate.getHours() - new Date().getTimezoneOffset()/60);
-  const newDatetime = currentDate.toISOString().slice(0, 16);
-  await page.$eval(datetimeSelector, (el, value) => el.value = value, newDatetime);
-
   await page.getByRole("combobox", { name: "Destination" }).click();
   await page.getByRole("combobox", { name: "Destination" }).fill("Ottensheim");
   await page.getByRole("button", { name: "Ausfahrt beenden" }).click();
@@ -153,6 +154,16 @@ test("Kiosk can start and finish trip", async ({ page }, testInfo) => {
   await expect(page.getByRole("listbox")).toContainText(
     "Nur 2 Ruderer können hinzugefügt werden",
   );
+
+  // Trip starts 2 hours ago
+  const datetimeSelector = '#departure';
+  const currentValue = await page.$eval(datetimeSelector, el => el.value);
+  const currentDate = new Date(currentValue);
+  currentDate.setMinutes(currentDate.getMinutes());
+  currentDate.setHours(currentDate.getHours() - new Date().getTimezoneOffset()/60 - 2);
+  const newDatetime = currentDate.toISOString().slice(0, 16);
+  await page.$eval(datetimeSelector, (el, value) => el.value = value, newDatetime);
+
   await expect(page.locator("#shipmaster-newrowerjs")).toContainText("cox");
   await expect(page.locator("#steering_person-newrowerjs")).toContainText(
     "rower2 cox",
@@ -166,15 +177,6 @@ test("Kiosk can start and finish trip", async ({ page }, testInfo) => {
   await page.goto("/log");
   await page.locator('div:nth-child(2) > .pt-2 > div > div > div:nth-child(2) > .border-0').click(); // 2 trips currently running, try to close second one
   
-  // Add a minute
-  const datetimeSelector = '#arrivaljs';
-  const currentValue = await page.$eval(datetimeSelector, el => el.value);
-  const currentDate = new Date(currentValue);
-  currentDate.setMinutes(currentDate.getMinutes() + 1);
-  currentDate.setHours(currentDate.getHours() - new Date().getTimezoneOffset()/60);
-  const newDatetime = currentDate.toISOString().slice(0, 16);
-  await page.$eval(datetimeSelector, (el, value) => el.value = value, newDatetime);
-
   await page.getByRole("combobox", { name: "Destination" }).click();
   await page.getByRole("combobox", { name: "Destination" }).fill("Ottensheim");
   await page.getByRole("button", { name: "Ausfahrt beenden" }).click();
diff --git a/src/model/logbook.rs b/src/model/logbook.rs
index 797a2fc..20585ef 100644
--- a/src/model/logbook.rs
+++ b/src/model/logbook.rs
@@ -104,6 +104,7 @@ pub enum LogbookUpdateError {
     SteeringPersonNotInRowers,
     UserNotAllowedToUseBoat,
     OnlyAllowedToEndTripsEndingToday,
+    TooFast(i64, i64),
 }
 
 #[derive(Debug, PartialEq)]
@@ -127,6 +128,7 @@ pub enum LogbookCreateError {
     ArrivalSetButNotRemainingTwo,
     OnlyAllowedToEndTripsEndingToday,
     CantChangeHandoperatableStatusForThisBoat,
+    TooFast(i64, i64),
 }
 
 impl From<LogbookUpdateError> for LogbookCreateError {
@@ -150,6 +152,7 @@ impl From<LogbookUpdateError> for LogbookCreateError {
             LogbookUpdateError::OnlyAllowedToEndTripsEndingToday => {
                 LogbookCreateError::OnlyAllowedToEndTripsEndingToday
             }
+            LogbookUpdateError::TooFast(km, min) => LogbookCreateError::TooFast(km, min),
         }
     }
 }
@@ -517,6 +520,17 @@ ORDER BY departure DESC
         if arr.and_utc().timestamp() < dep.and_utc().timestamp() {
             return Err(LogbookUpdateError::ArrivalNotAfterDeparture);
         }
+
+        let duration_in_mins = (arr.and_utc().timestamp() - dep.and_utc().timestamp()) / 60;
+        // Not possible to row < 1 min / 500 m = < 2 min / km
+        let possible_distance_km = duration_in_mins / 2;
+        if log.distance_in_km > possible_distance_km {
+            return Err(LogbookUpdateError::TooFast(
+                log.distance_in_km,
+                duration_in_mins,
+            ));
+        }
+
         let today = Local::now().date_naive();
         let day_diff = today - arr.date();
         let day_diff = day_diff.num_days();
diff --git a/src/tera/log.rs b/src/tera/log.rs
index 9b42eba..8fe3131 100644
--- a/src/tera/log.rs
+++ b/src/tera/log.rs
@@ -227,7 +227,7 @@ async fn create_logbook(
         Err(LogbookCreateError::ArrivalSetButNotRemainingTwo) => Flash::error(Redirect::to("/log"), "Ankunftszeit gesetzt aber nicht Distanz + Strecke"),
         Err(LogbookCreateError::OnlyAllowedToEndTripsEndingToday) => Flash::error(Redirect::to("/log"), "Nur Ausfahrten, die in der letzten Woche enden dürfen eingetragen werden. Für einen Nachtrag schreibe alle Daten Philipp (Tel. nr. siehe Signal oder it@rudernlinz.at)."),
         Err(LogbookCreateError::CantChangeHandoperatableStatusForThisBoat) => Flash::error(Redirect::to("/log"), "Handsteuer-Status dieses Boots kann nicht verändert werden."),
-
+        Err(LogbookCreateError::TooFast(km, min)) => Flash::error(Redirect::to("/log"), format!("KM zu groß für die eingegebene Dauer ({km} km in {min} Minuten). Bitte überprüfe deine Start- und Endzeit und versuche es erneut.")),
     }
 }
 
@@ -300,6 +300,7 @@ async fn home_logbook(
         Ok(_) => Flash::success(Redirect::to("/log"), "Ausfahrt korrekt eingetragen"),
         Err(LogbookUpdateError::TooManyRowers(expected, actual)) => Flash::error(Redirect::to("/log"), format!("Zu viele Ruderer (Boot fasst maximal {expected}, es wurden jedoch {actual} Ruderer ausgewählt)")),
         Err(LogbookUpdateError::OnlyAllowedToEndTripsEndingToday) => Flash::error(Redirect::to("/log"), "Nur Ausfahrten, die heute enden dürfen eingetragen werden. Für einen Nachtrag schreibe alle Daten Philipp (Tel. nr. siehe Signal oder it@rudernlinz.at)."),
+        Err(LogbookUpdateError::TooFast(km, min)) => Flash::error(Redirect::to("/log"), format!("KM zu groß für die eingegebene Dauer ({km} km in {min} Minuten). Bitte überprüfe deine Start- und Endzeit und versuche es erneut.")),
         Err(e) => Flash::error(
             Redirect::to("/log"),
             format!("Eintrag {logbook_id} konnte nicht abgesendet werden (Fehler: {e:?})!"),