"How long does Botox take to work?" seems like a trivial patient question, but answering it well is quietly a retention and efficiency tool — because a patient who doesn't know neurotoxin takes time to develop will conclude it failed before it's even started working, panic, and call you worried (or worse, tell people it didn't work). The onset question is an expectation-setting opportunity, and the practices that handle it well prevent a predictable problem.
This is general education for owners, not medical advice.