Hello I’m Bert and I recently did a project that was make an I beam. It needed to be out of cardboard and it took me around 3-4 hours. When it was testing time I had pretty low expectations and when I tested my first I beam because there was a school design and a your design I would be proud it would hold 1 pound = a can full of beans. When it passed my expectations I got pretty excited. Actually my design held better because the schools design bent and my design did not.