P fed to sleep at night and for daytime naps when I was at home (I had to return to work when she was 8mo) until she was 13 months. And that only changed because I chose it. We night weaned at that time.
I agree that feeding to sleep is soooooo much easier than anything else! But we were having other issues overnight and I felt I needed to night wean for other reasons. Then we weaned altogether at 14 months. Is sad - there are times when I wish I could just whip out a boob and settle her down.