Heck, I do that I vacation, here on Earth. On a typical week long vacation, my wife and I will EACH take 200 - 300 pictures (both film and digital) no problem. I've been on trips with same really hard core photographers who will take that many in a day.

I worked as a photographer for a year while in college. I'd easily shoot 200-300 photos during a single football game. If I'd had a really good camera like the ones they took to the moon, I would've taken many more. Sports photography (especially during night games) is tough. You take a lot of shots hoping that a handful will capture the exact moment when something special happens. On the moon, they had large capacity film magazines. If the lighting conditions were tricky, you'd want to shoot several shots at different exposure settings to make sure you got at least one good one. If you weren't able to aim the camera very well (and they weren't), you'd take more shots to ensure you'd get at least one good one. You can easily take several shots per minute that way, do some other work, then take some more.