For purposes of this part, and except as otherwise specifically provided, the FDIC begins computing the relevant period on the day after an event occurs (e.g., the day after a substantially complete filing is received by the FDIC or the day after publication begins) through the last day of the relevant period. When the last day is a Saturday, Sunday or federal holiday, the period runs until the end of the next business day.
12 C.F.R. §303.4