If I am not mistaken, I saw recently that R’ Chaim Kanievsky paskened that if somebody is davening what would be considered an unreasonably long Shemoneh Esrei, that you are M’ikar hadin allowed to walk in front of him/her even within 4 amos if necessary. When asked what is considered unreasonably long, he responded ‘anything more than the time required to be mechaven to the Pirush Hamilos.
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