Hi, I made an investment on Hashflare.io that i would get return in 8 months, but the dificult per block of bitcoin will increase in the middle of the year, my investment wil take the double time for return?
Yes, you may need double or even triple the mentioned time periods to reach the ROI. But if you are ready to consider your returns in fiat equivalent for profit/loss calculations you may get yourself into profits zone in less than 8 months itself too.
Difficulty is nothing but some representations of how much completion is happening right now with bitcoin mining. When more people will be joining in the race of bitcoin mining, you will be getting lesser share, hence obviously you will be needing more time to recover your investments and then profits.