You can hold for one year, for two, or three - though you should look after the cycles of BTC in order to get the most out of it if we are talking about it only from the investment side.
Everything else on the market has more risks, older alts - not that much, but newer ones - totally.
Investment is not for short term but should be for long term if you want to get profit from investing. Investing especially in new projects is very risky. Most of the projects that are coming out in the market today, the coins of this Tap Tap project are not very popular with people, so no one will be in danger by holding all these coins.