If you get more than 2.5k the first day(which isn't such a problem if you get 1-2 purple launchers, you can buy a fuel sucker 2 or 3, radar 3 and a quite big fuel tank. That's all you need to finish(and some time). I tried doing it again while making a video, but it was too long for youtube(it wasn't going too well, fell down 8000 feet once) and too long to watch. If you're interested, I can split it and upload it, but the quality won't be great.
I did moon in 4 days and mars in 6 but was surprised how easy it is compared to the first. Most of the stuff you never have to buy. You just need a couple E-rockets and a comrade or 2. You dont really have to have the launcher built up much at all.
4 days to the Moon and 6 days to Mars. On My second try I got to the Moon in 2 days and the Mars in 4 days. Pretty easy if you have have time and some luck.
It took me 15 days my very first time. I thought it would be like the old and not go thought the center of the earth (no i did not read the instructions).