How long does it take kidney stones to pass out of the bladder?

I was in the ER about 72 hours ago, and they said I had a 3mm kidney stone that was just about in my bladder, as well as a UTI. They gave me a shot of Torodol for the pain, and Bactrim. When I woke up later that morning (about 9) I was able to urinate (which I hadn’t done much of for a week). The pain/spasms in my bladder and back were also improved. Now, 3 days later, I feel 90% better – but no stone in my strainer. I assumed the pain lessened because the stone went into my bladder, but will there be more pain when passing this stone? Or will I be okay from here on out? How long does it take to pass?