Keep in mind the when the deer find the first one, being a demand feeder, the feed won't last long at all. I'll say they will empty it inside a week. They will work well when there is lots of other things the deerlike to eat in the vicinity. After they get used to it, they will visit it, take a few bites and then move on if they have plenty of other native browse and food plots etc. At least that's been my experience. You can make one very easy with a 55 gallon barrel yourself and not have to pay big shipping fees. I'll tell you how mine are made if you are interested. By the way, the raccoons, etc will play havoc with this feeder especially if it's put on the ground like the one in the pictures. If they decide that there might be something in there that they like better than what they see, they'll sit there and dig until it's empty, kind of like a kid looking for the prize in the cracker jack box.

The second one gives you the option of feeding when you want to and how much you want to feed. The two I have feed a little twice each day and last about 2 months the way I have them set. It's not going to feed the masses but it does keep them around a little and allows for some great picture taking. It sounds like it might be a better choice since you are going to be away for a while at a time. You can do this yourself too by buying the same 55 gallon barrel, the timer/feeder of your choice and deciding how you want to elevate it.

The only other advise I'd give you is to feed them something a little more balanced than just corn. It seems that everyone wants to feed corn and while they do like it, it's not all that good for them if they aren't used to it and there are lots of things better as far as protein, etc. All that will be up to you. Do a little internet research and see what is being said about feeding solely corn.

Good luck. You're going to have lots of fun and work ahead of you and don't be afraid to ask question so you save a lot on time/expense/work, etc. Also remember there are lots of experts out there that have lots of ideas that aren't all necessarily correct. Just read and listen and do your internet search homework and then put it all together to work the best for you.

Have fun.