thats right. Exiting will actually depends from every person because every person has their own set of goals. If your goal is to earn more and to possibly get rich , then  i guess youd better continue trading for a much longer time than usual. It is also a good idea to sell some of your holdings as long as you notice that you already earn a few because the market will continue to be more volatile and you might loose your possible income if you didnt act fast.

sometimes it is better to reward and treat yourself in order to keep more motivated on what you do.

But overall , there is no perfect time to exit trading because as i said earlier , that will always differ from the situation and from every person as well.