Does Botox sit in cell or is it metabolized quickly with motor function being regained ~ 3 months?

Botox and other neuromodulators take about 14 days to be in full effect once injected and the effects will gradually fade over three to four months. I've included a video about neuromodulators and how they are able to soften the appearance of wrinkles that I hope you find helpful.

Botox, or botulinum toxin, is a protein that enters the cell and prevents the nerve signals from telling the muscle to work. It is eventually metabolized and the muscle regains its function after some time, usually around 3 months. Hope this helps answer your question!

The Botox effect lasts between 3 and six months. Tge effect wears off by, we think, the development of new nerve terminals providing impulses to the muscles.
Other formulations of Botulinum toxin are being developed for shorter and longer durationsc