While doing some research on FMLA I came across this question on the DOL site “Does FMLA Leave Have to be Taken All At Once, or Can It Be Taken in Parts?”

The answer is it can be taken in parts,  FMLA leave may be taken “intermittently or on a reduced leave schedule” under certain circumstances. Intermittent leave is FMLA leave taken in separate blocks of time due to a single qualifying reason. A
reduced leave schedule is a leave schedule that reduces an employee’s usual number of working hours per workweek, or hours per workday. A reduced leave schedule is a change in the employee’s schedule for a period of time, normally from full-time to part-time.

You can read more about it here:
http://www.dol.gov/dol/allcfr/ESA/Title_29/Part_825/29CFR825.203.htm