Oh yeah, inches per bucket load, sure. I was talking about the depth of concrete that would be liquid at one time.
Well, if they were worried about concrete setting up in the bucket, I'd imagine within a few buckets poured, that the first bucket would start setting up.
Also, rebar would have to be set in place, as well as cooling pipes. So, I imagine they might only do a couple of feet a day per cube. But I really don't know.