Wildgame metal monster battery and feed life

I have bought a bunch of these wildgame stuff this year at Walmart and really like the ir cameras. Never heard of it before but it is simple and seems durable enough. cameras disappear at my camp so i am minimizing my loss this summer. They were under 75 bucks on sale and work great. My hunting buddy bought about half dozen of these wildgame metal monster feeders and I put them out with corn a week ago. I set one up with solar panel but the other five I didn't. I set all of them on medium to low medium on the spreader time. My question for the board is when will I have to refill them with corn and when do I need to check the batteries? I am hoping they will last a month or so a least. Thanks for any input advise of these things. We have big bears which have destroyed all the tripod feeders so this is plan b.( I know the 55 gallon drums with 12 volt batteries and solar panels are the best but I may or may not stay in this camp and I had to put these up by myself.)