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Finally, we went there. The bus took about 1 hour and 35-40 minutes to go from Viterbo to Orvieto. We could also check that there are other bus stops in addition to those shown in the timetable under the word "percorso".
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Kudos for getting everything right on such an awful design! I add more detail to complete your statements,
There are 3 buses from Viterbo to Orvieto in the weekdays and 3 on Saturdays. At the moment they seem exactly the same but it's possible during summer (August) they change the timings, frequency or even the stops for the buses running on Saturdays (that's why they are listed separately).
Percorso in Italian means Route, and the names you see when you click on each timeslot are the stops.
There are no buses on Sundays and during festivals (public holidays).
Edited in from a comment by @Hatef: I'm not sure how long it takes but since it goes straightly from Viterbo to Orvieto (approx. 43 km) I guess somewhere between 1 to 1.5 hours - the stops should be only the ones listed there (hence 7 stops).