you better get up 2-3 hours earlier than you plan to leave camp, to water/feed and check horses, and 2-3 hours after you get back to camp to do the same.
Not trying to be disagreeable here (I have no doubt you are far more experienced and knowledgeable than me), but what are you doing that could possibly take 2 h to care for the horses morning and evening?
I am certainly no expert, but I have had horses all of my life and used them out west a few times. Taking care of the horses never took me anywhere near that long. What do you need to do besides give them a look over, lead them to water, and give them hay? Obviously it's dependent on the number of horses, but I can't imagine that taking 2- 3 hours (at least it never has for me).
Not saying I am doing things correctly though - I can always learn to improve.
As for the diy drop camp in general I've decided its not worth it for me unless I have someone else that can stay in camp and take care of everything. If you do, it's awesome. Otherwise, it seems to be more hassle and worry than it's worth - thats just me though.