^ When the market has a continuous drop, DCAing is the best to apply when buying coins in the market. I think there is no point if when you will stop as long as you believe that the amount you have purchased is the amount that you can afford and are willing to wait when there is a profit, there is no need to stop. The possible profit may probably motivate you to continue investing in BTC in a DCA way of buying it.
Probably I will stop if my goal has been reached.