Patrick Wellenius wrote:
how does the scheduling of that work? I mean, do you do say, 4 runs per group and then cycle workers, like usual and just keep cycling for hours on end?
not sure I could physically handle 24 hrs of auto-x (or even 12). sounds awesome though

There is a "run line" rather than a grid. Whenever you want to run you just join the end of the line. The line can vary from an hour long wait between runs during the daytime hours to 10-15 minutes in the wee hours of the night, but there is a line throughout the 24 hrs. You sign up for a 2 hr worker shift in each 12 hr period, first come- first choice of time, at registration. Registration and tech are open before the start of the event, and for ~ 15 min at the top of each hour. As Shawn said, you declare to the starter if you are doing a practice or competition run before starting. You can declare up to 6 competition runs total any time during the 24 hrs.
Like our two day events you can register for either 12 hr period (Sat noon-midnite, Sun midnite-noon) or both periods.
I have seen groups rent a moving van or regular cargo van as mobile base/sleeping/eating facility. We just brought an alarm clock and moved to a quieter corner of the lot for 1/2 hr naps in the car. We would also bring a set of practice tires and a set of competition tires, make all the runs we could during the nite, then change tires and make our competition runs around dawn before it got real busy again.