Breastfeeding past a year?

Halley

So my missy just turned 1 and isn't feeding as often. She recently started sleeping thro the night. I will feed her when she goes to bed and then when she wakes up 630ish and when she wakes up from her naps at 10 and 230.

Even after the whole night it doesn't seem like my boob's fill up that much. I can tell there is still a let down and she is drinking but it can't be that much.

But curious at what point I will no longer produce?