Depends on what you know and what qualities you have. If knowledge and skills aren't reliable, then it's better to hold. If you still know something, you can earn much more than just holding for long time...
I agree on you mate that would depends on the time and if that would be too long their is a possibility that the token which does not have value will be having value. Maybe that would depends. I guess their is an exact time to hold and sell of the tiken you have.