We did 2/3 dives per day. Early starts and then late nights drinking beer on the beach. 34 degree days. 29 degree water.
As for watches, I took what I usually take! Old black G-shock and an old Seiko 6309-6040 (that I fixed up about 4 years ago, one of my first restorations, I take it on at least one dive every time I go)
All survived the crushing 23m depths!