How long does a Botox procedure to correct a wide, square jaw take?

Hello! Perhaps because I like chewy foods and have a habit of clenching my teeth while sleeping, the muscles under my ears are unusually thick and developed. When I look in the mirror from the front, my lower face looks wide and square, which stresses me out because it makes my impression look rough. So, I am planning to get a cost-effective square jaw Botox treatment. I am planning to visit Maypure during a brief break on my way home from work on a weekday. Approximately how long should I allow for the entire Botox procedure? I would like to know if the actual Botox procedure, excluding waiting time, takes only a few minutes while lying on the bed for the injection. I would appreciate it if those with experience could share how long it takes for the jawline to slim down and the degree of soreness. !