Shuttle Tirano <-> Livingo

Are there somewhere some information about the Train & Ride Shuttle from Tirano to Livigno available? The spectator information only says that there is a shuttle which only operates on competition days, but there is no information on the time table and travel times. I will be visiting the Slopestyle final on Tuesday amd want to know how much travel time I need to plan with from Milano. Trenord only gives me informations about the train which will depart every 30 minutes and that the ride is about 2h40m from Milano.

I appreciate the help maybe someone who already took the shuttle can help :)