A lot of that depends on your setup.. Do you have a digital, or 35mm? If you have a digital, and the battery life is pretty long, I would wait at least a week in-between checks.. sometimes a month wouldn't hurt. The less pressure you put on an area from going in and out to check your cams, the better. If you are using 35mm, 24 pictures could happen over night. It also depends on where you put it. If you put it over a regularly used mineral lick.. you will get a lot of pics fast. If you put it on a trail, the camera wont fill up quite as fast.