smash731:...45 min at 40 degrees in 5 foot vis...I started breathing in water and the DM took me up from 40 feet. ...
WOW - most of our dives in OW were under 45min. at 84* in 10-30ft vis with a max depth of 30ft... One of the guys went through an entire tank in 20 min under those conditions and had to swap with the instructor underwater (he was about your size too) for the second half of that dive... I'd say quite impressive for one of your first dives...
Best wishes on getting back on that horse and learning to enjoy diving!
Aloha, Tim
P.S. I hope I do as well on my first cold water dive... (later this year I'm hoping)