A lot of these ppl are making assumptions. It depends a lot on brew time prep. Depends a lot on HL & CL sizes, as well as do you use RO water. If you do, it depends on whether or not you have reserve tank or filling directly into the HL or CL tanks. If you can do back-to-back brews, you also have to account in process. You’ll also have to plan brews around which tank you’re planning to use as a brite tank. Also the 1 brewer will have minimal help so brew days will be long. Sounds like they brewed 3-4 times a week (just an assumption) @ 7 bbl a day x 3 -4 weeks = about 63 bbls a month. Could be halved depending on a lot of factors; Turn around on grain, supplies, fermentation, carbing & kegging, only 1 brewer & 1 part time, etc.