@doctor
There are few stops in between the 2 endpoints of the lake and yes at each end there is only 1 point form where the boats leave... it's just like the local van system (2 end points and many intermediate stops... :P)
It took us almost 1H 45M to around 2H to cross the lake from one end to the other...
And yes Gulmit is almost the 2nd last stop in the route... and is now totally cut off from other villages because of water at 3 sides and mountain at the 4th side... totally isolated... 