Just out of pure curiosity, I took one of my negatives (Tmax 100) and projected an image to a size over 5 feet by 3 feet onto a wall.
I used a Vivitar VI enlarger with a Nikkor 50mm f/2.8. Negative carrier is NOT a glass type. Lens was wide open.
To my surprise, the image was pretty good. I'd print it to this size if needed.... Of course it's not pin sharp and it won't stand close examination. But from say 3 feet away, it's quite an acceptable image. From 10 feet away, there's nothing wrong with it.
If I were to actually print this, I would probably close down the aperture a bit for more sharpness.
THAT was fun.... I was actually quite surprised that this is actually possible.
One of the things that came to mind as a potential problem is that at this magnification, exposing light will be quite dim and exposure time quite long. All enlargers leak light quite a bit which will be reflected by walls and some of that reaches paper. That needs to be prevented. Otherwise, it will fog the resulting image. Now, I HAVE TO TRY THIS.