Glad to hear from you.
There is no written rule here. I share in the videos how I do it, but it is up to everyone how long period one will use.
If you are comfortable with 2 weeks, than use 2 weeks.
If there are no trades, just wait until there are enough trades. Also, there will be times when all of the assets will lose, and in these times I Do not put any of the EAs on a challenge. I just wait for the next profitable run.
After the trial expires, you can keep the account. They won’t usually disable the trading.