Choose the Longer Duration command (from the Balance menu, or press Alt+RightArrow) to increase the duration of the highlighted item. Each time you select the command, the Duration increases by 5 minutes (unless you have selected the Alt+ Increments 1 Minute setting in Other Settings, in which case the Duration increases by 1 minute).
The Longer Duration won't increase the Duration of an item beyond 24 hours.
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