Each entry is either billable or non-billable. Only billable entries are offered when you create an invoice, and the Timesheet's day view shows how much of each day was non-billable.
Set the default
In Settings → Time tracking, turn New entries are billable by default on or off. You can still change any single entry from its menu.
Round to 15 minutes
Turn on Round entries to 15 minutes in the same place. Rounding happens when the timer on the desk stops, and a stopped timer always records at least 15 minutes. Time you type in yourself is never rounded.
More in time tracking
Start and stop the timer
Where the timer lives, what happens when you start a second one, and how resuming works.
Add time you did not time
Type in hours after the fact, in whichever format you think in.
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