In Built for Teams you can allow employees to take time off in either 1-minute increments, 15-minute increments, 30-minute increments, or in half-day increments. To change this setting, follow these steps:
Go to Settings > Paid Time Off.
Click the desired Policy you would like to set the increment for.
Choose the desired option in the "What time interval are time off requests submitted in" dropdown.
Save your changes.
When employees submit a PTO request they will now be presented with the appropriate options based on the setting you've chosen.
Note: If your account has one or more "overnight" schedules—where a shift starts on one evening and ends the next morning—the system won't allow you to do choose the half-day PTO request option. The system is unable to calculate the appropriate hours for a half day when the schedule crosses dates.