How long do you plan to breastfeed and why?

Alexandria • TTC for 4+ years. Got BFP on 6/15/2015 and estimated due date is 2/6/2016!
I'm just curious as I'm not sure what I want to do yet. We've been strictly breastfeeding and he's just about 2 months old.
 I'm thinking 6 months then no more boob but will pump bottles for a couple more months. Honestly the idea of him teething scares me away from wanted to go longer 🙃