Any invest in ICO take risk, especially if this doesn´t supported or not have time at the market. I meet people who invested more than 5 BTC in new ICO project and loss their investments, I know is a difficult to talk about it, because it´s about our own investment. This day i look for good new ICOs projects (previous analysis of each one) and decided to invest in these, I would like to have a reference about how much money normally your invest in a new project? 
simple, its depends how much money you can afford to lose my friend ?
because you know if invest in ICO is risky, right ?
yes, I agree with you, before knowing how much you want to invest but you also need to know how much risk you can receive (losing your money), so you can find out the amount of money you can invest in the ICO, because even though you have a lot of money but you don't dare to take risks (losing your money), so you better don't to invest in ICO because investing in ICO does have a big risk.