In how many days I will double a deposit?
I takes from 45 to ~90 days depending on the size of your investment.
That's long period mate.
I think if Double Bot admin choose to make the investment period shorter than this it will help to increase the number of investors in his site and could support it as well
Most legit investments are multiple months long for a ROI of 130-140% on average.
Don't get greedy and beg for double your money faster. Free money is free money.
You want it quicker? Learn arbitrage and start exchanging for yourself. Safer, because the funds are controlled by you and quicker because you choose when you want to do it.