Having a long-term target while investing in bitcoin is the best for any good investor but it doesn't really reduce the risks of losing because since bitcoin is a high volatile coin, volatility can push the price downwards at a time when an investor feels that the number of years he had in target has come, so it may be at a time when the price is experiencing a DIP due to an event that may occur at that particular period of time which means he has to be more patient in order to allow the price bounce back which is some cases, the investor may feel he is spending a lot of time waiting for the price to gain strength again which can make him to panic in fear that he may incur more losses if he waits further. This is one of the reasons while i feel people should not set the number of years they want to hold their bitcoin before they consider to sell part of it because it can appear at a time when the market is bleeding.  I think the major reason why we hold for long is to build our portfolio and not specifically on profits making.