I printed this panoramic photo of the Oslo Opera House as a gift to a relative. The measures are 40×120 cm. That would be approximately 16×47 inches using the idiotic system (it’ll actually make more sense to use nautical miles instead of the imperial system. In nautical miles the photo measures 0.000215983 X 0.000647948). It’s my largest print so far and I’m pleased with the result. It was printed on an aluminium plate (No! Not aluminum, but aluminium).
Apropos metric system, here’s something from The Oatmeal: