It really depends on the person unfortunately. My DD1 didn't nightwean completely until just before her sister arrived so around 2yrs 9months... AF had returned by the time she was 6months old despite hourly night feeds at the time. This time I'm feeding both DD1 (twice a day) and DD2 (around the clock)... AF returned when DD2 was 6weeks old and is like clockwork!! Felt a little bit robbed to be honest, hope AF is just around the corner for you so you can TTC number two