Fact is that why should you even leave in the first place lol. When things go rogue, what I believe is best to do is to stay around and study how things will go and you wouldn't even ask about when to reenter. But when you completely get out, you become more confused as to when to get in again.
Completely agree with you -- never get out 100%. Even when things are going well, I've learnt to take profit, but always leave a little something.
For an investor, things are much calmer, since he can always have certain assets that will be stored for quite a long time. at the same time, it is not possible at all to watch the cryptocurrency market at least a year. But for a trader, everything will look quite complicated. If a trader comes out at least a few months from the game, he will lose not only the tone, but also the general course of business that the trader absorbs every day.