How many Botox sessions do I need to see results?

I'm worried about the wrinkles between my eyebrows and the fine lines around my eyes. Botox I am looking into the procedure. I am writing to inquire about the treatment time and recommended number of sessions for Botox.

First, I would like to know how long a Botox procedure usually takes. I have heard that the total time from consultation to the actual procedure is short, but I am wondering if it is possible for an office worker to have it done during their lunch break or after work. I would also like to know if the time does not increase significantly even if multiple areas are treated, such as the glabella, eye area, and forehead.

I am also curious about the recommended number of Botox injections and the maintenance cycle. I understand that the effects of Botox last for a certain period after a single injection, but I would like to know how long the effects typically last and how many repeat treatments are required once the effects naturally wear off. I am also concerned about developing resistance or the effectiveness diminishing with regular injections.

I am also curious whether, for the first time, the dosage or unit is started low or if the standard dosage is used. It would be helpful if you could share the maintenance cycle and the intervals for repeated treatments based on your actual experience.