Between 11 and 12 months and I felt so jipped! I know so many with singletons that got at least 18 months out of it and I was *constantly* nursing two and I only got less than a year? Seriously bummed.
mine arrived right after their second birthday - and it was kind of weird - very light and short - and this month it was a week late and even lighter - I just do n't get it. I'm nursing non-stop around the clock still - def. every two hours or so in the night - thanks little one!
Mine are 18 months and there's still no sign of it. One of mine, in particular, nurses around the clock though (the other nurses too, just not all.the.time). He's HUGE too (go figure!). At this point I'm almost wishing it would come back - maybe my moods would be a bit more normal again.