Is the time required for a square jaw Botox procedure manageable for busy office workers?

Perhaps because I have a bad habit of clenching my teeth while sleeping, the muscles under my ears in my jaw have developed significantly. When I look in the mirror from the front, my lower face looks wide and prominently square, just like in the photo, making my overall impression look rough and rugged. I heard that Botox is the most cost-effective way to reduce jaw muscles, so I am planning to take this opportunity to get it. Since I am a busy office worker who works late often, I intend to squeeze in a quick visit on my way home. Approximately how long does the entire Botox procedure usually take? If the actual injection time is only a few minutes, excluding waiting time, I would book it without hesitation. I am also curious if I can resume my daily activities immediately after the injection!