GMDS, kindly answer my original question please. How long do YOU calculate the layover time should be, say in LAX, with a DXB-LAX block time of 16:30, based upon the calculations in your excellent original reply.
In my humble opinion:
Flights covering a time difference of more than 7 hours or in excess of 14 hours flight time, should be followed by a minimum rest of 36 hours. Such a rest period should be untouchable by daily irregularities. As I mentioned, the FDP-extension discretion on ULR should not be allowed to exceed 10% of the total duty, in our case this comes close to 2 hours. Add this to the rest, plus a cushion of unforeseen delay at the arrival airport (customs, traffic) and you end up with some 40 hours as a sound planning base for scheduling rest after ULR flights.