1 Be employed by a covered employer and work at a worksite within 75 miles of which that employer employs at least 50 people; 2  Have worked at least 12 months (which do not have to be consecutive) for the employer; and. 3  Have worked at least 1,250 hours during the 12 months immediately before the date FMLA leave begins.f your doctor does not certify that you or the loved one have a serious condition, then your employer can deny your FMLA leave request. IMPORTANT NOTICE: The Answer(s) provided above are for general information only.