But don't bid ULRs in a vacation month. Reason; they will use vacation days as days to be acclimatised in DXB. They perhaps will put an ULR standby the day after your off day,minus you must be in DXB on nights of your vacation.
If one lives far West, you will lose 2days of vacation to get back. For instance, leave ends on the 15th, off day on 16th, ULR standby on 17th. To make yourself legal, you will have to leave from wherever on the 14th, to have two legal nights in DXB, night of the 15 and 16.
Good luck. Has been done numerous times.