I'm surprised at the lack of a run that's all 6 careers. It would be a default category in most games, as that is a "game completion"

I'd think its because such a run would take upwards of 8 hours straight of driving

To be fair, that's light work for many runs on this site.

I've personally considered doing it but no one has been mad enough yet to give it a go, can add if someone fancies the challenge