When I was in college I ran a lot of snares in the road ditch. If I started at5-6am I found a lot of fox were still coming up to the road before 7am. If I checked too early I would catch a few after I came through. Then people would see them, steal them or think that I wasn't checking my snares. Fox usually move til 7-8am then lay down for the day, coyotes are moving until 10am a lot of the mornings.
If your equipment is working right you won't have hardly any trouble with loosing animals due to escaping. I have maybe one in a season or two seasons that gets out on a three day check. I go to a two day check if the heat is a problem.
Some people have to check before daylight, it would be better if the sets were on private land and out of sight of passers by.In IA you seem to have a couple pheasant, duck, deer, coon hunters passing by everyday or night. It can be a real pain putting up with the thieves and bunny huggers. Out west I usually see that my tracks are the last ones made three days before I return. That is nice to know no one has been in there to bother with stuff.T20