I'll assume that it was shoting 2000 rounds per minute, with each bullet going at 853M/S (Mach 2.4). Although I don't usually do it, here it would be necessary to use the anime, since it is impossible to get a solid time-frame from the manga. Loading Video... The Death Shower...
18 Garou the GOAT [LAntihero villain]-Edit anime edit onepunchman garou opm 00:21 饿狼🐺「EditionAMV EDIT 4K」 00:44 吹雪📸 00:17 地狱的吹雪「MANGA EDITI」 00:16 金属球棒BEST HERO - Metal Sayan S Class 15 | One PunchMan 00:16 Garou - Edit Manga vs Anime Opm 3 Season Trailer...