Hugh W. Nibley relays unsourced claim that papyri rolls extended through two rooms in the Mansion House.
Hugh Nibley, "Phase One," Dialogue: A Journal of Mormon Thought 3, no. 2 (Summer 1968): 101
We are told that the papyri were in beautiful condition when Joseph Smith got them, and that one of them when unrolled on the floor extended through two rooms of the Mansion House.