It depends on your settings, 1,2,or 3 pic groups, wheather you use the video mode, wheather you are using a memory card in it, and your deer densities. I can leave mine out for 3 days and have 400 pics using a 3 pic group setting. Just remember, the more you go into an area to check it, the more of your scent you are leaving behind. I am checking mine about once a week right now. But with my memory card I can do that. With out a memopry card - and relating to your deer densities, you might fill the memory in one day. It all depends on your set up and your comfort level of entering the area. Good luck and good huning.