I think it depends. If you can do 12-15 pullups, you've got pretty much all the strength you'll get from them, so it then becomes a matter of developing muscular endurance.
If you can do a LOT of pullups in one set, then maybe 250 in an hour is okay. Stew Smith, in his workouts for preparation for enlisting in the Navy SEAL BUD/s training or Army Special Forces training, recommends doing 200-300 pushups in sets of 20, 200-300 situps in sets of 50 - 100, 200-300 4-count flutter kicks in sets of @ least 100, and 200-300 pullups, in sets of 10. He recommends doing this 3 days a week (Mon/Wed/Fri).
So I mean, if you do 10 pullups and your back is fried, I wouldn't do 250 in an hour, because then you're "destroying" your muscles 3 times a week; but if you can do 20-30 straight pullups, I'd try doing 20-30 sets of 10 or something like that. But I'd only do it 3 times a week, like he says.
He says the day may come that you have to do 1000 flutter kicks, which he says, if done in the 4-count way, can take 45 minutes. That is one hell of a killer on the abs and hip flexors!!
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"NOTE - never piss off a guy who can clean in excess of 350lbs as the upward pulling motion transfers very nicely to the atomic wedgie" - lifter
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