If you invested on bitcoin and want to make profits you have to wait for years,it may happens earlier if you are lucky but you are not going to lose any money by investing on bitcoins when you hold it for too long period.
Investing in the Bitcoin for long term, like 10 years+, is kinda no-brainer thing for me. I believe that crypto will thrive in the future so buy now and keep it safe and just forget about it is sounds a good plan
Holding the coins in the long term is always good but don't put all your money in Bitcoin because we have diversified all our money into different other investments because after bull run 2017, suddenly the price of Bitcoin crashed to 5000$ which makes to lose more value. We should always be active in the market in order to sell them when the price of any coin reaches its ATH in the market.