Ango came to be conducted not only in summer, but also in winter (toango), and the number of conducted ango was counted towards one's career in the Buddhism world, giving it much significance and making it a criterion for future promotion.
夏だけでなく冬も行うようになり（冬安居）、安居の回数が僧侶の仏教界での経験を指すようになり、その後の昇進の基準になるなど、非常に重要視された。