[skinnerd]

I'll let it idle 10-15 minutes before the 1st run.
Then after that, the engine really doesn't cool down that much with 15-20 min between runs (if you have that much), so I just start it back up right before I'm ready for my next run.

I don't think it's great to leave a car idling that long really.
I mean, this is when your engine is at its lowest lowest oil pressure. Do you really want to run your engine that long in those conditions?
I think this is when you really get your most elevated wear on your internal parts. Just my thoughts...