On average I think any guild with more than 40+ people will need to be brewing at least over 20-40 hours a week just to make all the supplies required.
This also doesn't include the time hunting for supplies or buying supplies. I think everyone can agree this is not really sustainable as more WoEs go by since the people that actually perform the potting want to play the game as well (Mvping, making new characters, guild parties for fun, etc...).
Edited by Shane, 02 May 2020 - 04:34 AM.