we keep the coins at least 5 years , but its too long imagination. you can proof it. 2018 early NEM coin was top 6 Marketcap now 56. so keeping its useless. we have to updated everytime and get the action the correct time and exit.
Do keep in mind that
not all of the coins are benefit for 5 years of hodl. If the team and supporters are losing its faith then it's over.
If you would like to invest some, then invest it on some already good one such as Bitcoin and Ethereum. I'm even surprised if those new coins even survive in next 1 year despite majority of them have shady business and roadmap going on right now. Although it's not all of them, I would be really careful if I would like to hodl the coins.