What is the average ico Maturity date?
Let's say i invest in ico Today...
How long I should wait to get decent profit?
Usually? 1 year?
You can't predict when it will happen. Ussually you will get decent profit as soon as the token got listed on popular exchange sites. After that, it will get dumped by investors or bounty hunter and the price will dropped so much.
How big exactly decent profit you mean? 5x from your invesment?
Not necessary that the price will drop as soon as ico gets listed. How to make a successful bounty campaign in which participants will believe is one of the hardest things to do as an ico.