diff --git a/src/references/exclusive.md b/src/references/exclusive.md
index 93084f74..291718c5 100644
--- a/src/references/exclusive.md
+++ b/src/references/exclusive.md
@@ -1,5 +1,5 @@
 ---
-minutes: 7
+minutes: 5
 ---
 
 # Exclusive References
diff --git a/src/references/exercise.md b/src/references/exercise.md
index 5374fb85..3b41f217 100644
--- a/src/references/exercise.md
+++ b/src/references/exercise.md
@@ -1,5 +1,5 @@
 ---
-minutes: 15
+minutes: 20
 ---
 
 # Exercise: Geometry
diff --git a/src/references/shared.md b/src/references/shared.md
index 661a8d98..cb99da3f 100644
--- a/src/references/shared.md
+++ b/src/references/shared.md
@@ -1,5 +1,5 @@
 ---
-minutes: 10
+minutes: 7
 ---
 
 # Shared References
diff --git a/src/references/slices.md b/src/references/slices.md
index 825a1677..bb4cb3cf 100644
--- a/src/references/slices.md
+++ b/src/references/slices.md
@@ -1,5 +1,5 @@
 ---
-minutes: 10
+minutes: 7
 ---
 
 # Slices