How long does postpartum recovery really take?

Aside from when you can have again and when you can exercise and return to work, how long does true postpartum recovery take. I mean, when do you really start to feel like yourself again. I have heard some women say that it was up to a year before they felt 100% again but I don't really know what that means. At 3 mos postpartum, I often feel weakness in my extremities and my back is out of whack. Can I expect this for several months to come?