After coming off cerazette mini-pill it took 3 weeks before I had a period. I hadn't been on it long though, only 3 months. It seems to vary a lot amongst women. I am now hoping my cycles will be back to their normal 28 day length (had a LOT of bleeding while on cerazette, one of the reasons why I stopped it)
A doctor friend of my OH's told me the other day that doctors can never say to patients on the mini-pill exactly what will happen when they go on or off it because anythiing can happen. When I went to my old doctor to talk about coming off it he seemed very concerned that I had carried on having periods and said I may not be fully protected. I asked my new doctor about it and she said that was rubbish. I think they really can' tell women for sure what should happen because it's pretty unpredictable.