Hey Nicholas,
I don’t really depend on the time period as one or two weeks. Sometimes, there will be more or less trades opened.
But two weeks is enough to check the recent top performers. Then you need to keep in the challenge only the top performers.
Regarding the risk. The set files are for the testing account and if you trade the EAs individually.
If you decide to put more than 1 EA on a challenge, you better lower the risk.