818
Answer: It is a Torah mitzvah to hear the shofar on Rosh Hashana (though not on Shabbat), consisting of 3 teru’ot, with an added sound before & after each teru’ah (a simple tekiya). In all, this would be a total of 9 shofar blasts. But since there are 3 types of terua – shevarim, akin to sighing, teruah, akin to crying, & shevarim-teruah, a combination of both – our custom is to add these sounds and hear at least thirty shofar blasts (shevarim-teruah are considered two blasts). An enhancement of the mitzva (for a total of 60 blasts) is to sound the shofar during the chazan’s repetition of Mussaf. Some rabbis went further, increasing the mitzva to 100 blasts (or 101 for Sefardim), including during the silent Amida. It was the Ari HaKadosh who spread this minhag to most Jewish communities
This year, due to the Corona, crisis, many venues are "streamlining" the tefilot, in order to minimize gatherings and accommodate outdoor minyanim. Sounding 30, or 60 shofar blasts would be Halachically proper and absolutely fulfill the Mitzva.
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