It really depends what is your strategy and if you really know and support the token.
If we talk here about something that you received from a bounty campaign, I might think here to keep it a bit more because you didn't invest anything and even if you lose it, your money is not in a risk and you might only lose a potential gains.

If we talk here about a position, you by yourself probably know what is your position and why you entered it, following that reasons you will be able to make the decision to sell or not to sell.
Remember investing in tokens is very dangerous and shouldn't be invested with money that can't be afforded to lose.