Yes you can. Both admins and employees can request half days. 

For Admins:

Step 1: Select Employee Time Off tab and add new request
Step 2: Insert the same date in the From and To field
Step 3: Insert number of days in intervals of 0.5 or you can also use the increase/decrease button in the No. of days field.

For Employees:

On the app, employees can likewise increase/decrease the number of days as they wish.

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