Torque wheel lug nuts each stop?

Fyi.
You cannot touch the tires in the hot pits.

You can only
1. Switch driver
2. Add ice to the cool suit cooler
3. Ad gas after the driver has exited and before the next one enters

We torque them down before the car goes out on the track day 1 and then again on day 2. In the northeast, we use the hot pits so you can't do it unless you pull the car in.

When torquing hot, I reduce the wrench setting about 10 lbs from cold. We start @ 100ftlbs cold

Just to make sure it's 100% clear, you cannot do this in Lemons in the hot pits. If you are using the hot pits during a Lemons race, you cannot do anything other than take the driver out, add gas, then add ice to the cool shirt and put a driver in. If you want to bring the car into the main pits, or if your track does not use hot pits you may do other work.

My own experience, if you find that your lugs require tightening every pit stop, something is wrong. Most teams I know torque them in the morning, and check them after the day is done once things have cooled down, and that's it. If you find that things are loosening up you either have a mechanical issue with the actual lugs/bolts/studs/wheels/mating surface or you have a problem with your torquing procedure. You should be checking that the mating surfaces of the hub and wheel are clean, that the threads are clean and free of unwanted grease/dirt/other, thread all lugs/bolts on basically by hand to make sure the wheel is seated flat, then torque. It's a really good idea to roll the car a small distance and torque again as when you lower the car the way the suspension moves will try to cock the wheel in like it wants positive camber, which can affect your torquing. By rolling the car you get everything to settle to the natural state and you'll be sure you did torque to the desired spec. We will often torque the wheels on, then drive to the gas pumps to fill for the day, then torque again and it's not uncommon for a few bolts to snug up a little more. Over torquing can lead to problems too. Don't up the torque setting from recommended unless you're switching hardware and the manufacturer tells you to.

In 20 something races We have only had a wheel loosen up once. I felt it happening, on the straights I started to feel a shimmy in the front end. Brought the car in, had the bolts checked and the driver's front took almost a full turn of tightening. We think that wheel wasn't checked in the morning. Otherwise never a problem. We're using OEM bolts/hubs/wheels and torquing to standard 81ft-lbs (saab's spec).

We check them before Saturday's session, and since we usually swap tires after Saturday and before Sunday, they are torqued properly before Sunday's session.  Have never had an issue in 35+ races.

Same as most - we check torque Saturday before going out, rotate tires Sat evening (hot, so good and snug but not torqued), and check torque cold on Sunday am before going back out. Never an issue.

After 29 Lemons races, we’ve only had one wheel loosened due to improper install.  The lug caught on the lip of the rim instead of seating properly. 

Lugs coming loose is not a common problem.  If they do it’s normally a installation issue.

Your pre-race routine should be to check tire pressure and lug nuts each morning before going on track.  Then each time you change tires.

Be sure everyone on the crew knows your desired cold tire pressure and lug torque specs.

Other than that it’s over kill and normally not necessary.