diff --git a/episodes/02-arrays.md b/episodes/02-arrays.md
index bd29a619..182377fd 100644
--- a/episodes/02-arrays.md
+++ b/episodes/02-arrays.md
@@ -1,7 +1,7 @@
 ---
 title: Arrays
 teaching: 30
-exercises: 30
+exercises: 10
 ---
 
 ::::::::::::::::::::::::::::::::::::::: objectives
diff --git a/episodes/03-loading_data.md b/episodes/03-loading_data.md
index 21038835..4362f298 100644
--- a/episodes/03-loading_data.md
+++ b/episodes/03-loading_data.md
@@ -1,6 +1,6 @@
 ---
 title: Loading data
-teaching: 35
+teaching: 25
 exercises: 15
 ---
 
diff --git a/episodes/04-plotting.md b/episodes/04-plotting.md
index 69056c50..a28812c2 100644
--- a/episodes/04-plotting.md
+++ b/episodes/04-plotting.md
@@ -1,6 +1,6 @@
 ---
 title: Plotting data
-teaching: 30
+teaching: 50
 exercises: 10
 ---