The image could be sized at 200 to 240 PPI (pixel per inch) since its a 40 inch photo, viewing distance will be about 3-4 feet at least.
 
300 PPI would be better, but you can imagine the file size required, about 575 Mb for a color image at 8 bits.
 
Printing resolution or speed, could be at least 720 dpi or even 1440. Dont think it matters much.
 
Cheers,
Andre
 
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