How long does Botox around the lips continue to kick in and can it wear off quicker than other areas as it is the mouth?

Hi. I had botox to my upper and lower lip for "smokers lines" 3 days ago and noticed the effects within 24 hours and am still noticing them now day 3....it kicked in earlier than most and i am an emotional wreck hoping it doesnt continue to work for much longer as i am already having difficulty eating and talking and am noticing sagging at on corner of my mouth. How long will it keep getting worse and will it wear off faster around my mouth than other areas?