Here are the canvas size limitations (where "width" refers to the shorter side and "length" to the longer side):
Canvases (standard): 140 cm width (55 in), 200 cm length (79 in).
Canvases (gallery): 120 cm width (47 in), 200 cm length (79 in).
Canvases (rolled): 140 cm width (55 in), 200 cm length (79 in).
Framed canvases: 140 cm width (55 in), 200 cm length (79 in).