How do exactly the TeleportService:ReserveServer() woks?

Ok, I have a doubt: how do the TeleportService:ReserveServer() work? I want to make a game where just some users will be able to enter a server, that ik how to do it. The problem is that I want the game to dure 1 week. The players will be able to enter the server along the week and just they will be able. Can I create just 1 private server and teleport the players there once they join along the week? Or the server will disappear once the last player leave for first time?
If someone can help me I willl thank it too much.