My system will works perfect in long term. Yes, I can accept that but without profit. If you want 130% you must wait month. If you want quit I will return 100% of your investment (in 48h).
Sounds good.

Also, if investor withdraw before the contract ends, then no profit?
What if I invest, and after about half a month, I want to withdraw? No profit too?

Unfortunately yes. If everyone do something like that I would have no money to investment and my system will be little "frozen". Why not wait 720 hours and get 130%?