Hey Facundo,
Glad to hear from you. I usually use the strategies as long as they work. If I find the logic behind the entry and exit indicators, I usually optimise them carefully, including the recent Historical data.
And I include many EAs in the courses for the people who can not afford EA Studio and FSB Pro. This way, all the students have a huge variety of ready Expert Advisors.
Make your routine so that you will feel comfortable. If you have the time to do it every day – run a reactor before going to sleep and see the results in the morning. If you do not have the time, do it one-two times a week. It is up to you. Obviously, the more you work on it, the more profitable strategies you will end up with.