Tons of times, with many games. The most was probably LoZ: OoT, probably played through it at least 10 times. Lulz, I remember that the last time I tried to play through it was also the first time I did the problem in the Water Temple, where you open locked doors in the wrong order and if you save the game, you're completely screwed. >_<
Was that actually a thing with the water temple ~_~? I thought people were just skipping over a key. If that can happen, it's really bad design.