I've had my membranes stripped once. It was done on a thursday, I cramped and had bloody mucus that night and over the next few days the cramps increased into contractions and more bloody mucus, I went into full on labor Monday afternoon.
I had mine done twice, both times it was campy. at 41 weeks my body wasn't ready and after a day or two the campy feeling went away for the most part. Although at that point everything is campy to begin with, lol. Then at about 42 weeks I had it done again and had some cramps, then with in 3 hours had contractions 10 min apart. It's different for everyone how it works, and it seems that if your body isn't ready it won't work.
I had my membranes stripped and went into labor within 48 hours! My doctor told me if it was going to work it would be within that time frame most likely.