In Tabs3 Customization, there are timer options that allow you to set minimum hours and an amount by which to increment when you go past the minimum.
If the timer amount is less than the specified Minimum, the software will round up to the minimum increment specified. For example, if the Minimum specified is .25 (15 minutes), and the task is six minutes, it will be rounded up to 15 minutes.
The Increment setting allows you to specify the portion of an hour you want to round up to. For example, if the Increment specified is .25 and the task is 18 minutes, it will be rounded up to 30 minutes.
To set the timer options to round up time in 15 minute increments