Jim you are right, the time limits are quite doable as we shoot Eron's Money Match with the same rules except it's only one day and all at 1000 yards. I've shot my paper patched .45-90 a couple of times in that one. You certainly don't have much time to wait on a condition though. It's pretty much do your wiping routine, while trying to watch the flags, a quick look at the mirage and dial something up. Starting with good elevation values sure helps .
I find that I eat up a few extra seconds on each shot because I want to watch the bullet impact through the spotting scope. It sure helps if you come off the target to know approximately where you hit the dirt .
Chris.