19 trays

Hi ☺️ I just got my Invisalign 3 days ago and my orthodontist told me I will have 19 trays and be done in 12 months , but 19 weeks /trays is only 19 weeks which is around 4/5 months . Could I be done sooner than 12 months if I’m very consistent ? 🙏🏼my top teeth are pretty straight I just have over crowding on my front lower teeth .