i think so risky if you Holding bitcoin a long time , may be just 3-6 Month it's good . but , if you already got cheap or profit you should sell your bitcoin , and waiting dump again .
I think that holding bitcoins for a long time is quite a gamble for some because of the unstable value of bitcoin form time to time.
No, holding bitcoins definitely pay you off. Bitcoins dont let you regret your patience and time you spend on bitcoins. Many people have been able to achieve their goals by the courtesy of bitcoins. Those who are investing into bitcoins now and are holding them for future, they will have lush future in the coming years.
I don't see that it can be good to hold it for a long time as and also selling it so if there will have a chance to have it a profit then go why not.