I means that you will only be able to enjoy the full profit in any investment if the investment is terminated,if you have invested in cryptocurrency and you terminated their investment that means you have decided to sell it out, well I believe that you can only be able to enjoy the full profit when everything is over.Not all investments have a contract. When you invest in stocks you buy and you get the certificates of ownership. You can keep that for a long time if you want because there is no expiration. You can also sell the stocks if you need the money. Even in forex trading there is no expiration on how long you will hold onto the currency.