At what degrees do you you prefer to to dry your skins after you flesh them and how many hours do normally wait to flip them to fur side out?

How many hours will depend on temperature and air circulation.

When the skin is just barely tacky to the touch, it is ready to turn. If the pelt gets too dry, wrap it in a most towel before trying to turn.

Moist towel - NOT wet!! You don’t want to rehydrate the skin, just limber it up a bit.

It varies depending on temps and humidity. I catch mostly red fox and a few coyote. I only heat my fur shed in the mornings when we get back from running the line.

In below freezing temps you can't tell when the skin-out fur is ready to flip. When I warm up the shed in the morning I check the previous days' put-ups to see if they're ready. Under the front legs and around the ears is where I check to see if they're dry enough to flip. Foxes usually take a day or two even if it's below freezing, coyotes maybe an extra day.

I'd rather have them dry a little longer than flip them too soon. I also sometimes use borax to speed up the drying if I'm running short of boards.

Forgot to add, I run a fan on them pretty much 24/7 while they're drying.

I should start using a fan.

Yotes: I wait 12+ hours and then flip. Then I put back on the wire stretcher and use a mink board, on edge, as a wedge, and dry for a couple days to a week in the fur shed. We use a fan to circulate 50-60 degree air.

I run my garage at 50 degrees and bump it to 60 if I’m out there working. I usually skin everything the evening that I catch them. I wash them and wring them out an give them 10 towel snaps to get rid of as much water as possible. Then they hang until the next morning. The fur is usually pretty dry by then and I flesh them and get them on the boards. If I’m going to be around the rest of the day I put the fan on them and can turn them in 4-6 hours. If I can’t be around later then I leave the fan off and turn them the next morning before I go out to check. I check MWF each week. Unless I have two lines out. We have 72 hour check requirements. If I have two lines then one is MWF and the other is TTS and the skinned and washed fur goes in the freezer until I get time to flesh and stretch. I have unistrut on the ceiling with an oscillating fan mounted upside down on the ceiling. Once the hide is fur side out and hanging on the unistrut the fan runs continuously. After 3-4 days the hide comes off and goes on a hanger.

If I put a coyote on the board in the morning the hide gets turned 4 - 6 hrs later. For me the leather needs to be dry to the touch but still pliable. The temp is at 55 degrees and no fans.

Shop is 55 degrees, high volume air closet, turn them in 45 minutes to an hour.

Can you explain how an air closet works?

Flesh yote hides, borax them put on stretcher fur side out...DONE.... been doing it for 15 years , no problems !

Fans for circulating air are important for drying any hide even coon hides (except maybe rats those are so thin they dry quickly also fox or cats) get a fan on them. When hanging a bunch don’t let them touch either need space between them.
I put coyotes on wire or boards skin out for about half a day but I check them periodically then flip when ready. My garage stays fairly constant but every Yote hide seems a little different and if I had to wash them first they get dried by fans with hides laid out flat on floor on tarp for awhile first then fluffed up with a snap or two in the air (like snapping a towel) don’t ever put em up wet if I wash them.
Not sure on temp in my garage but it’s always north of freezing and I do have a heated garage if I want to heat it though I rarely turn that on. Circulating air is more important to me than temp I just don’t want it too warm.
Take em off when fully dry and snap em again to fluff them up and then put a half dozen on a hanger and freeze up the stretchers for the next batch. I don’t have a ton of stretchers but I can keep the finishing going a decent pace and cycle through my equipment like that as I go.
Jim