Wow - what depth were you
That sounds so awesome. I am so glad that you're having as much fun as you expected on this trip :). Also, you must be part marine mammal, no way could I stay in water that long...
Genetic and cultural!
During my only snorkeling in Hawaii (age 30), I went a couple hours until too cold(!), warmed up on the beach, and returned for another hour+.
Also: we trained her in Lake Superior (Keewenaw Peninsula) -- just over 1 year old, she spent a couple afternoons: walk in, "swim", come out; eat blueberries on beach; repeat endlessly :)
Sounds amazing! Will add to bucket list.