It depends on its market cap, if I think it can rise more, I hold it. ''I aim to hodl forever'' what a option? So you are waiting those coins to die. It is all about potential.
Yeah, no. It depends on what are you investing in, if you like trading shitcoins, better be out quickly, but if you aim at solid projects (nothing is risk free tho) you should always aim at that perma-hold.
I always buy coins that i could see myself holding in 1, 2, 3... years.