All "Boosted" (1-Phase) challenges have a rule that requires you to have a minimum of 3 active trading days to pass the challenge. This means that you need to have positions open on at least 3 separate days during the challenge.
If the trade opened and closed on, for example, the 17th of March, that would count as one active trading day. However, if a trade is placed on the 17th of March and closed on the 20th of March, this still counts as one active trading day.