in 2008, one complete trip across the line took twenty-eight minutes in the west–east direction and twenty-nine minutes in the opposite direction. as with all lines of the paris métro (with the exception of the "bis" lines), the first departure of the day leaves the station at 5:30 am. a train leaves from "boulogne – pont de saint-cloud" at 5:35 am, preceded by the first departure on the line from "porte d'auteuil" at 5:30 am, which is also the only train that will take passengers on the turn-around loop at "auteuil".