diff --git a/content/activities/201909-cryptoparty.md b/content/activities/201909-cryptoparty.md
index 6f03c848..bfd06f39 100644
--- a/content/activities/201909-cryptoparty.md
+++ b/content/activities/201909-cryptoparty.md
@@ -1,7 +1,7 @@
 ---
 kind: event
 startdate: 2019-09-14T12:00:00Z
-duration: 4h
+duration: 3h
 title: "Cryptoparty in der Stadtbibliothek"
 location:
   location: bib