The last attack I had was about 6 hours that put me in the hospital, when I got them (attacks) before that I could ride them out and feel better the next day but the last one was the big one. Funny thing about it was I never knew I had gallstones till I was in the hospital and they did a ultra sound and found them I always thought I just plugged up because of something I ate. I went and looked at the jar and the biggest one is about 1/4" but there must be 20 very smaller ones. Man a 1/2 inch one must have been some killer pain, get that stone out of there before another attack hits. DT