As I have heard sometimes it lasts less than 24 hours...I am just thinking that ovulation will be delayed because of the longer period? Usually I am a Day 14 on the dot ovulater...now we are on Day 15 ond no surge yet...If my lining doesn't change and I don't O, I am wondering if I should just add a little exta estace now to see if my lining will grow a bit. Otherwise will just start estrace at beginning of net cycle to try to get the lining thicker. I would be happy wuth 7mm- by lining struggled from 5-6 last cycle. I was just hoping that my lining would be better on its own since I have been pregnant on my own before. I was thinking maybe I didn't respond well to synthetic estrogen. Maybe I need to give it another cycle- this is just the first one off meds and it is not back to "normal" yet....thanks for your replies!