How long do you insist on breastfeeding

Most of the people around me end breastfeed in 10 months, rarely more than one year old, and almost none at the age of two. My children are almost 17 months old, obsessed with breastFeed. Eat a little complementary food every meal，l have to feed she several times at night with Breastfeed, I can't sleep well every day. I am afraid that Frequent night breastfeeding will affect her development. I want to quit breastfeeding after the Mid-Autumn Festival. Although I originally planned to feed it until I was over 2 years old, Although I was going to let her quit breastfeeding naturally.