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The FMLA guarantees eligible employees the ability to take unpaid family or medical leave for up to 12 weeks every 12 months. Employers with FMLA-eligible employees have choices, however, as to how they wish to set these 12-month periods. The FMLA allows employers to choose any one of the following methods for determining the "12-month period" in which eligible employees may take up to 12 weeks of qualifying FMLA leave: