PaulS:
Time is a fudge-up with longs but you got almost 25 days find that bug, and if you kludge your way around it then it will never get you except that you won't get why unsigned's are right for handling time.
No too many people can ride for 24 plus days at a time, without gas or other stops, so this isn't likely to be a real problem.
May be someone very excited about the cruise controller may ride and sleep both..just like a crazy little boy with his new toy 