Well I do think if a investor wants to invest in Bitcoin it will be for a very long time. There are going to be alot of times he makes gains but also he will lose some of those gains.
For me I do think a long term investment in crypto must be more then 10 years. In that 10 years there will be alot of cycles to see how the price does change.
If a investor does last this long then he can be a good investor. It is those traders that lose all of their capital because they want to get rich so quick that does not make profit in a long term.