Do you know how long it takes someone to get 24 hours playtime if they play a healthy amount per day (even at 1 hour per day that's 24 days).
Does this mean that this is a bad idea? No. Not at all. HOWEVER I'd like you to consider this scenario. It is 10:12 AM EST, and there are 6 players on Jailbreak. 5 of them have more than 1 day on the server but no microphone, and 1 has just joined for the first time, has a microphone, and is at least somewhat competent to give simple orders. Yes, this player doesn't know the rules the best, but for the game mode to run, someone has to be on blue team. Nobody can join blue team since nobody has a mic or playtime, and they cannot get playtime without playing normal rounds. This is a hypothetical, but if this does ever happen, everyone just leaves and does something else with their time. the server goes to having 0 players, which discourages people to randomly join, creating a negative loop. However good this may be for peak hours, I believe that this decision holds some inherent risk which may drive away new players.