Time between shots for all strings/ groups is 2 minutes on the small guns, 5 on the big ones. I have a timer in my shooting crap that I use. Chamber the next round at the same point in the countdown for each shot usually also.
I also just added an IR thermometer because I want to try tracking suppressor temps shooting the 300 RUM/ 338 LM. Seeing actual temps might change my mind.
I usually bring a 22 or 17HMR to the range and bang away with that waiting on barrels to cool.
I'll do as the Texan does and rotate two rifles with a timer set at 3 minutes, just make darn sure they are not any type of interchangeable cartridges that can be confused, I talked with a surgeon recently in Cabelas who did get them confused and is lucky to have his eyesight, literally blew the mag out the bottom of the rifle.