I can get 20k a day whilst getting 8 hours of sleep per night.
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You guys wouldn't believe me if I told you it was straight up car missions. You need to know how to get unstuck from collisions which you can do, just nobody really knows about it, you need to know how to get the mission fast, and you need to know which mission person to go to. And then you need to know the map very well and then money just rolls in.
Which car mission guy do you go to?
http://http://www.era-go.com/forum/showthread.php?26136-Car-Job-Money-Making-Formula
Car mission details, link above^
Not too bad, 2 days and a half... you'll still be fine, ha