I was thinking quicksave-and-quit, because quicksave is more for allowing people to play a 2-hour dungeon in 20-minute segments. But that doesn't exclude having real savepoints in required locations like near bosses or after hard parts.
Small rant - I'd also have checkpoints before bosses, so when you die you start right there until you load. It avoids the "Oh, look, a savepoint in the middle of nowhere, I bet there's a boss around here," thing, which I hate.