Periods of a particular duration
(2) These rules apply only to a leave involving more than 20 percent of the working days during the period over which the leave extends. For example, if an instructional employee who normally works five days each week needs to take two days of FMLA leave per week over a period of several weeks, the special rules would apply. Employees taking leave which constitutes 20 percent or less of the working days during the leave period would not be subject to transfer to an alternative position. Periods of a particular duration means a block, or blocks, of time beginning no earlier than the first day for which leave is needed and ending no later than the last day on which leave is needed, and may include one uninterrupted period of leave.