The first day take six hours and start from San Bernardino village. After the climbing until the pass from San Bernardino, turn on the Sud side and you pass again up the the village. The view from this elevation is marvelous and allowed to peer all the Mesolcina valley. The first day end to refuge Pian Grand. It is possible to reach Pian Grand climbing from San Bernardino village trough the pass di Passit. In this case the time to reach Pian Grand is 3 1/2 hours.
For the second day you need 8-9 hours and allowed initially to reach de alpe de Trescolmen and then the Trascolmen sea. Following in the same direction (south) you reach the sea Calvaresc that has a form of hearth and then the alpe Calvaresc. From this point the the lodge Buffalora is not any more far away.
The third day need 7 1/2 hours. The way goes southway and allow to look from the high the fabolous Calanca valley. Initialy it is possible to see on the left the Piz Groven. After pass the refuge Alpe de Fora you reach a beautiful wood and going through you reach Santa Maria in Calanca. From Santa Maria you can take the bus that bring you first in Grono and then in San Bernardino.