Custom games run time

Does anyone know if theres an actual run time on custom game lobbies? (for Halo Reach if it matters) Like will the server ever end/crash, or will it just keep going forever until ended or all players quit? Thanks for any help

Custom Games only end when either the condition of the match set by the host is met (ie number of kills, flag captures, bomb scores, rounds, etc) or when the host decides to end it. So theoretically as long as the host remains in the game and does nothing, a Custom Game can go on for days if players keep leaving and joining.