Common commercial brewhouse sizes are 1bbl, 3bbl, 7bbl, 10bbl, 15bbl, 20bbl, 30bbl, 50bbl, and 100bbl. There are sizes in between and certainly sizes larger than that. Most commercial breweries double or quadruple batch (a 7bbl brewhouse may work with 15bbl fermenters or a 30bbl brewhouse with 120bbl fermenters). And breweries at production scale with seperate mash, lauter, kettle, and whirlpool vessels typically eventually end up rolling 24/7 or close to it (a 30bbl 4 vessel brewhouse running optimally probably turns the brewhouse every 3 hrs, producing as much as 240bbls per day). Largest craft brewhouse I've personally seen was a 50bbl brewhouse with 250bbl fermenters. This was a second facility for a brewery operating coast to coast.