Hey Nicholas,
I think in the videos you watch I answered straight to your question “how long do I run the test before I can take the EA to my live account”:
I take the best performer from the last 1 week. So everyday if you check in Analysis the 1W time, you will see which EAs are the most profitable ones.
And recenly, I look at the last 3 days. So I aim at shorter period of time.
Cheers,