I've just had my second one...so for me was around 12 months. I can tell you though that it's more intense than before and I hate it. I seem to have more pain and discomfort the day or 2 before than I did before becoming pg with Oskar. I'm glad though that I lasted that long without getting them Oh I had one day many months ago where I had the slightest amount of brownish discharge but that was it.