Actually, long time holding can as well be the smartest thing to do and as well the dumbest thing to do pending on the the particular altcoin that is involved. When one have the coins from a good project with high potential, then holding such coin for a very long time can be worth the wait. On the contrary, when one has the coin of a project that does not seem to have good potential, holding such coin for such a long time will not be the smartest thing to do at that moment, because that individual might end up losing everything.