I have used Bottom Time Divers for night dives and these are generally a single dive after two day dives. However, we have done a twilight and night dive for two tanks. We have done many dives on Cedral Pass, top of San Francisco wall, Santa Rosa (top), Dalila and La Francesa and Villablanca (if everyone outvotes me
.) I can't say I have ever done two night dives. You would get back around 11 pm as an average. Maybe later depending on where you stay. Sunset is about 6:30 pm the first part of October.
Be good at ducking behind coral heads. Cedral pass can be fast and it's not long.
In years past, we stayed south before I lived here and Raul (DM/Owner) would come down south. Lately if we have only two divers then he stays closer to Fonatur marina due to costs which means Paraiso normally unless he has other divers staying south. Then we dive southern sites.
I can say generally on the southern reefs mentioned above, you won't see other boats/divers on night dives. We generally don't do the walls at night for unpredictable currents (the out and/or down kind). The Palancar and Colombia sites are too far for one tank dives. Your chances of going further south increase with two tanks.
I would contact him and let him know what you want and he can tell if he can accommodate you. He will most likely poll his current divers. He wouldn't go out for a single diver. On the other hand, if you pay alot, he'll go (like rent the boat).
btw San Francisco and Santa Rosa should be closed if they are maintaining the reef closure rotation in October and November. I have not seen an update to the 2020 closure list.
Not alot of people want two night dives. If any dive op has morning two tank dives, then doing two night dives makes for a long crew day.