For me it is worthy to wait for that long upon investing into major Altcoins because they have a greater capacity and capability of improving their prices compared to the regular Altcoins. Major Altcoins do have more potential so even holding for a long period of time will be worthy because investment is not intended to be rushed because it really takes time for an investment to gain its profit. Right through this year, Altcoin market have shown us positivity in a sense that the prices of Altcoins undergo certain increase and improvement after a long run of downfall. But still the decision relies on you if you are that patient to wait for a long investment or not. Also, always check on the price behavior to help you decide if you will still wait or sell depending on the situation you are currently into making sucj decision.