diff --git a/README.md b/README.md
index 99203d1..6de1f99 100644
--- a/README.md
+++ b/README.md
@@ -10,9 +10,9 @@ Voice, recording device, digital audio editing software.
 2. Number each room (don't forget utility rooms, bathrooms, closets, etc)
 
 3. Following your sequence, visit each room (one at a time) and do the following:
-    - Record about 30 seconds of room tone
+    - Record 20-30 seconds of room tone
     - Say the number of the room aloud
-    - Record about 30 seconds more of room tone
+    - Record 20-30 seconds more of room tone
     - Stop recording, move to the next room
 
 4. Splice together the recordings, in order of the initial sequence