I have made it up to Stage 9 and it's going to take like 2 or 3 maybe 4 services to complete it... I don't feel like playing this game all GD day... If I do the Dalorean and move my clock forward 3 hours then back, will it screw up the Maserati challenge?  I won't be moving the clock to the next day... just ahead a couple hours.

And sorry in advance for the probably stupid question... I messed up the last Audi Spyder challenge and don't want to mess this one up!  Thanks in advance!