I don't have time for Endurance races, I'm out with my Girlfriend a lot only really get to play from 10pm - 1am at a push, most of the time its earlier.
I shall try re-doing the Dream Car Championship then! Thanks!
I'm assuming you're at 31.25 and not lvl 7.5. Dream Car is your best bet. If you don't mind auto A-Spec grinding you could keep repeating the Indy DCC event.