Mine returned at 27 months, and the cycle was very short, at 21 days, with bleeding for 10 days. The cycle is gradually getting longer (24 days, after 8 months), and the bleeding days are fewer (5-6 days now). I believe I am ovulating (no temp charting, but I do have tons of EWCM) but have a short LP.
I am also older (40), and think I might have slight thyroid problems. I did have short LPs before DS, and I took progesterone early in my pregnancy with him. I add these details to demonstrate how my PP cycles might be affected by things not related to the fact that it took over 2 years for the cycle to return. DS nurses 2 times a day and was nursing about 3 times a day when my cycles returned 8 months ago.
DS, 10/07. Allergies: peanut, egg, wheat. We've added dairy back in. And taken it back out again. It causes sandpaper skin with itchy patches and thrashing during sleep. Due w/ #2 late April, 2012.