Computation of time will be based on calendar days. In computing any period of time prescribed by the chapter, the day on which the designated period of time begins is excluded. The last day of the period is included unless it is a Saturday, Sunday or legal holiday when the Department is not open for business. In such a case, the time period runs until the end of the next day which is not a Saturday, Sunday or legal holiday. Intermediate Saturdays, Sundays or legal holidays are excluded from the computation when the period of prescribed time is seven (7) days or less.
Idaho Admin. Code r. 20.03.02.170