In GF min rest was 9hours from hotel checkin to hotel check out.
Captain SOP was not to give a new departure time to ground staff on landing but phone it in when all your crew actually had checked in at the hotel and been issued keys to made up rooms that you had seen.
They then actually answered the phone on such occasions as they were under pressure from Bahrain.
This technique also ensured ground staff actually cared and aided you to clear customs and immigration on arrival by seeking to get your bags to you and see you onto transport to the hotel PDQ.
Give em an ETD at the aircraft and you would be abandoned.
Then generally you waited for bags and transport until the Captain or FSS organised it.
Just getting office and ground staff to do their job correctly and not to lie to crews was the hardest part of every trip for the Captain and Fss.