Submit the Request for Leave of Absence Form as soon as need for leave is known. 1. Complete a Request for Leave of Absence Form as soon as need for leave is known. 2.Request for Family or Medical Leave must be made, if practical, at least 30 days prior to the date the requested leave is to begin. How Do I Request FMLA Leave? Contact the BSC Benefits Team. Request to Return From FMLA Leave: I should fill out the top portion of the form, notifying Human Resources of the date of my return.