Between 1.5 and 2 five-gallon buckets!?!? So that means you've eliminated more than 5 gallons of stones? Are you sure? The liver by itself has a volume of way, way less than 5 gallons, I thought. How did you come up with those numbers?
With all of those stones out, you must be feeling a helluva lot better.
For my own calculations, 28 mls of stones would have roughly the same volume as 1 ounce of water. But in my previous post, I was trying to explain that it would probably weigh less than 1 ounce. Sorry if my explanation was confusing.