So I've read lots of general statements about having 1000 mason bees per acre to effectively polinate the trees. But on the flip side how many bees will a single mature fruit (let's say Apple if we need to be specific) tree support?

I have 3 mature fruit trees in my backyard and wonder how many mason bees will be too many? When will there not be enough pollen to support the bee population im growing? Can one tree support 100 bees? Or 1000 bees? Just curious if anyone has experimented with this?