Yes... I have 2 systems, one where I can do 15 gals and one where I can do 45 gals. On the larger one I can
split the wort between 3 kettles, one 30 gal and 2 x 15 gal so I can hop 4 different scheduals/bitterness/flavors.
When I chill I sometimes mix it up in the carboys by soaking special/dark grains to take a base beer even farther,
it just depends how much work I want to put in it.
Max output for one of these brew days is 12 carboys, but it is a lot of extra work before and after - sorting/grinding grain,
sorting/weighing hops and getting all the timing correct... plus all the carboys and yeast pitching !
I can also pull off 2 different types of beer by using first runnings only and batch sparging to get a small beer... this could be
lager or ale, Belgian, Barley Wine, Imperial beers...
Pulling off the big brew day usually adds 3 hrs on top of my normal 6 hr single brew day so it is pretty taxing especially if your having a few pints during