Changing the duration of a Master Service List item is easy.

​Step 1: Go to Settings > Master Service List

Step 2: Click on an item in your master service list.

Step 3: Change the duration

Step 4: Save
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Step 1: Tap Menu > Settings > Master Service List

Step 2: Tap on an item in your master service list.

Step 3: Tap "Duration" to change the duration.

Step 4: Save