What are the average and maximum amounts of time a submarine would stay submerged?

[Tim_T-Bonham.net]

@Whack-a-Mole

IIRC for boomers they deploy for around 2-3 months. They stay submerged the whole time. The main thing limiting their time at see is available food on board.

Fast boats I think do more calls to various ports and will not stay submerged for as long (although they could again with the limiting factor being the amount of food they are carrying with them).

Confucius: “Give a man a fish and he will eat for a day; teach a man to fish and he will eat for a lifetime”. Can’t we teach them how to fish on these submarines?