It was 3am when I asked for it, and I waited maybe an hour tops? They had to wake to poor guy up lol. Although I wasnt in agony or wanting it for pain-relief per se, it was so I could relax my body and get back the cm I lost after 3 hours of pushing and no baby. It was exhausting trying not to push anymore & relax. Thankfully they didnt does me up heavily, everything after but the contractions was still painful. It was just enough to do the job I needed it to.