Stored glycogen typically supplies energy for about 1.5 hours of intense exercise.

“now in one respect you're not going to run out of carbohydrates until you're many hours in these folks are are unique case but the average individual who who's doing an hour hour and a half cardio even you're not going to be limited by your carbohydrate stores you're going to be just fine you limited by some other things which we'll maybe sort of break down here in a second um but you're going to be fine there”

“now we don't have that much stored glycogen right you've got maybe 00 maybe 200 gram of glycogen if you have really big muscles stored um which you're going to run out of pretty quickly that's going to supply you for maybe an hour and a half so thereafter you have to meet your needs from body fat and intake of carbohydrates”