In general, the FMLA entitles employees to up to 12 weeks of unpaid leave per year for a spouse or an immediate family member with a serious health condition, or when unable to work because of a serious health condition. Employers covered by the law are required to maintain any pre-existing health coverage during the leave period and, once the leave period is concluded, to reinstate the employee to the same or equivalent job. All school districts are covered by the law, although not all educational employees are eligible if he or she has worked for the employer for at least 1250 hours during the preceding 12-month period and the employer has at least 50 employees. Teachers are presumed to have met the 1250-hour requirement.