OM-A 7.9.3 Limits on Two Flight Crew Long Range Operations
If you operate back from far east with 2 crew only, you'll be unaclimatised and need to apply factored sectors as per OM-A 7.9.3 Limits on Two Flight Crew Long Range Operations
3 crew means no factored sectors and normal FDP = 11:30 iso 09:45 for 2
If flight time is more than 10h, each crew will get at least 3h and FDP can be extended, if not, we are not limited so no need to extend anything.
Keep it in balance in any case