Cash is 4*8 I beleive, played it this morning or yesterday it was either 4b or 4b*8. Can't be sure anymore, with a fully maxed out vehicle you can easily beat it in the day provided. seems most people legitly get there around 14-18 days. on the last section of the game you can sit and flip your vehicle after it's been maxed which causes you to 'fail' that day. due that til it says day 14 then just beat it. takes all of like 15-20 minutes.