Typically, you buy during the first week of ICO. The reason is because ICOs usually give more bonuses at the start and decrease this promotion slowly as the weeks pass. An ICO for example would give 100% bonus on the first week, 80% on the second week, 60% on the third, etc, etc.
That being said, my recommendation is to stay away from ICOs because you said you have "no time to research." Never buy any ICO without proper research. You need a solid project with a good team, and a real world use. Otherwise, you'll just be wasting your money.
This ico is about a month, yes? I'll try do it on a second week because of hyip decreasing.
Oh yeah? Nice username you got there.