6 or 7 weeks.. I also remember hearing that once they reach a certain weight they sleep better -- I want to say 14lbs but I don't remember. That of course is not scientific.
Sorry hon, AT didnt drop a feeding till he was over 3m old. We went from 2 night feedings to just one.
It will get better, the first 3m are the hardest. Just survive. Hugs!