I have never weighed the combs or the entire TBHs. My main demonstration TBH, has never been moved. It's about as big as they get. 34 bars, and a 19.5 inch comb length (top to bottom). When I built my first, this was suggested as the maximum before serious comb drop would be an issue.
I do know when full of honey, each frame must be at least 10 pounds.
My plans now are for any new TBH to use standard frame bars. (same as standard hives)
The comb picture is a bar from the pictured TBH.