I got 3 days just barely. I don't even remember how, but I know I used all three propulsions, and the height was slowing so much, but just barely got to the space limit.
I guess you have to get REALLY lucky and get alot of money on the first three days. My personal best is seven days. I thought I was lucky just to get seven!
I made 3000 in first day! 4x gold launcher combo! Then you're pretty much finished at 3th day... or 4th at 100% In raw collected money it was something around 55-60$ you have to jump to at least 1000-1500 ft and stay up as much as possible then your fist day is success!