When I'm going to do "serious" brewing, I usually go to a more isolated cauldron than the MC because I'd prefer not to have another PC "breathing down my neck," "@emote'34ing," and "pestering me" about how their super-duper potions are more important than mine. Or how I'm "wasting" herbs.
I assume your PC wasn't born with a 61 in herbalism?
because (a lot of) people aren't time efficient with the current one, using the cauldron for training and dawdle while doing it...
Didn't you have to train at some point yourself to get to that 61?
FWIW, I always batch brew, and if someone shows up wanting to use the cauldron, I tend to finish the bottles I have, log out, and try again later. But if a PC were acting as you describe, you can bet your bippy I would be in no hurry to free up the cauldron