Paul we have "Racecar Night" every Wed. The whole team comes over for dinner, then we work on the car until we have it serviced or it gets too late whichever is first. Usually 11:00PM or so.
On Mondays after a weekend I go over and unload the car, drain the fuel tank and service the fuel system. The car owner and I usually will leak it on this night also, so we know what if anything needs done on Wed for racecar night.
I and Scott {car owner} will spend whatever other days are necessary, sometimes none, sometimes a lot more.
We try not to have the team out too often to keep from burning out their families.
Rapid