Think beyond coyote...Bobcat, cougar. In my experience most coyotes come in 2 to 5 minutes. I say that because that is what usually happens. If they are close and within hearing, they come in. The latest I have had a coyote come in was 20 minutes and that was once, I was thinking it must have been traveling and then came into hearing range. I do think the longer you stay a traveling predator is more likely to come in to hearing range. OR you can move on hoping to get into hearing range. For me, after 10 minutes I start thinking about Bobcats and dreaming about cougars. For coyote I usually stay 15 minutes before moving on, but I base this how long on how good of stand I think it is. This time of year I will stay 30 minutes hoping for a bobcat. My first bobcat I shot about 1 PM in January.
Along time ago I read an article in the "Trapper and Predator Caller" the author had notes from all his hunts and based on his research he would only stay on a stand 9 minutes. Based on his notes the majority of the coyotes came in under 9 minutes, very few came in after. So, for him it was 9 minutes and he was out of there and on to the next stand. He was trying to get in as many stands as he could.
The important thing is to be out there. Try to get in as many stands as you can. It is tuff for every stand to be perfect if you are hunting by yourself, it all was seems like you are giving up something (never the wind). Usually if someone is hunting with you, you give up less, but don't let that stop you from hunting by yourself. As in combat never push a bad position, try to get all the advantages on your side. The wind, elevation without sky lining, field of view, something breaking up your back ground, up against a tree, brush, farm equipment, fence post, comfort: the more comfortable you are the longer you can sit still, rifle up ready to shoot, TRP target reference points already ranged....also as in the old westerns if you can manage it the sun on your back