It's depend you, want hold for long term or enough profit for first launching market, everything can happen in crypto, event good project can falling down, if you feel enough sell and move to another project.
it is also still depends on the coin because if you have a utility coin in your wallet to be hold then you really need to wait with a minimum of one year but if the coin is no good purpose then you should better sell it in the market and look for another project that it seems like a good one for investment.