On days when the Kohanim Duchan, why do the Kohanim only do it once (during Mussaf) and not in each Shemoneh Esrei? [revised question]
Nusach Ashkenaz says Shalom Rav at Mincha most days. However, when there is Birchas Kohanim (such as a fast day), they say Sim Shalom. Is there a connection between Birchas Kohanim and Sim Shalom? If ...