I am in Canada where the standard paper size is Letter, 8.5 " x 11".
When one use Save as PDF, for unknown reason the paper size of the PDF file is 10.63 " x 13.75". Thus for a portrait report, you need to make the layout 13.75" in width. Where do come that paper size. Interestingly, this is 1.25 times the size of Letter .
Do some one know why there is a factor of 1.25 ? For those who may wonder, this size is not some kind of European paper size Ax.