The rules aren't that bad ...
Specific start date, either Easter or Summer.
3-5 starters (machines not people), 3+ finishers.
Declare a route and distance beforehand, final distance must be within 20% of your specified distance, subject to minimum 360km. (If it'll be under, control short. If it'll be over, get to your planned finish, then do an extra bit.)
Control in the 22nd hour (if you've started at 0900, that's between 0600 and 0700 the following day), then cover at least 25km before your 24hr control.
No single stop of longer than 2 hours.
See - easy ...!