I've passed 2, first was in 2007, Friday afternoon I started feeling pain in my back that wasn't bad at 1st, by about 6pm I was rolling around on the floor in agony and my wife insisted on a trip to the ER. Sat in the ER for almost 2 hours before I finally got to see a doc who diagnosed the stone and said there was another 1 in the other kidney. After getting some really good pain meds I went home and decided not to cancel a Kalama trip I had planned for the following morning. I was fine and even caught a springer out of the 1st hole, about noon things went to hell, the pain med made me sick so not only was I in pain but I was puking my guts out and this is at the Beginners Hole, still had to row down to Modrow which sucked big time. That stone took me 8 days to pass, some days were pain free, others, not so much. On the 6th day I had to fly to Alaska, passed the stone on the morning of the 8th day, right before my guests got on the boat, huge relief.
Second stone was a year ago and I was woke up about 2 in the morning and knew exactly what it was, rolled around on the living room floor in agony for 3 hours then passed that stone. The 2nd stone hurt worse but only lasted 3 hours, If I ever have another 1 I want the 3 hour stone.
Good luck!