How much extra time should I allow for the lifting procedure?

I am a busy working woman looking to book a quick appointment for facial elasticity management to address sagging skin, utilizing my weekday evening time after work. Since I need to finish the treatment and leave before the evening clinic closes, I absolutely need to calculate the overall timetable. I am wondering how much time I should allow for the entire process—from visiting the clinic, registering, and consulting with the manager, to the topical anesthesia application, and finally the actual injections—to ensure it doesn't interfere with my commute home. I have heard that some places use the latest equipment and are so fast that the actual tip injection time finishes very quickly, within about 15 minutes; I would like to know if this is true. I am also curious if I need to allow a longer time for anesthesia because the pain is severe enough to make my bones ache. I am writing this to inquire about whether it is feasible to squeeze in a lifting procedure during a weekday evening and to know the actual time required for the injection stage.