diff --git a/materials/exercise_r.md b/materials/exercise_r.md
index a880bfb2..8682035d 100644
--- a/materials/exercise_r.md
+++ b/materials/exercise_r.md
@@ -10,7 +10,7 @@
 :::{admonition} Timing
 :class: note
 
-75 min
+45 min
 
 :::