I'd say the sooner the better. I mostly work in the evenings so I'm free during the days if you aren't too overwhelmed with eager patients.

[Generally Vanitas doesn't get violent unless he feels like he's being manipulated or is threatened himself, but of course he can also be wildly unpredictable. Being under the Sanguis moonblessing hasn't helped with that, either. But... Normally he's fine, if a bit blunt.]