Permitted FDP on a four sector day are as follows:-
Start Time (Local)
0600-0759 = 11 3/4
0800-1259 = 12 3/4
1300-1759 = 11 3/4
1800-2159 = 10 3/4
2200-0559 = 10
Discretion can be a maximum of two hours over the first, second, and third sector and three hours if used immediately prior to the last sector