It depends on how yourself, but that's not the problem because ive passed it before. If i predict in long-term it will fall foreverr so i will sell soon then try to take profit with another coins.
Long term investment is not forever there is always a time frame to sell it, for me 15% profit for short term investment at the current situation of the market is already enough for me to sell my coin but if it is for long term i will keep on holding it looking for more than 15% profit.