Best chance is on the Canon, on my plain Z3100 the limit is near 2.75 meter and Qimage can not help then. On my Z3200PS it is way over that size. printed over 5 meter so far. You could try on the Z3100 on cheap paper. If the image is say 3 feet wide and 11 feet long and the print is beginning the 3 feet wide may be cropped to less than one foot wide. That is an indication that it will not print above say 9 feet length in my experience.
Met vriendelijke groet, Ernsthttp://www.pigment-print.com/spectralplots/spectrumviz_1.htm
December 2012, 500+ inkjet media white spectral plots.