B3, I would certainly agree that wet & winter are incompatible; I'm fortunate to have a bottle buddy that is just as keen as I am to keep-in-the-deeps as much as possible...
With proper thermals, we typically run :80 dives x2 for a dive day. Though chilled somewhat at the end of the day, a nice, hot, rum toddy will rewarm the core!
That's why I like the "Digging and Finding" forum--it's great vicarious adventure! A less than modest income, together with ears and sinuses that didn't want to equalize at even 12' when free diving, kept me from pursuing SCUBA. Thank you, to all the bottle hunters who share their adventures here, especially the divers.