I used the Google Map version at the bottom.
I didn't expect the world to be so big:

I didn't expect the world to be so big:

Today's XKCD must have taken Randall several years to draw...if you click and drag, it goes on forever. Or not quite forever, but Dan Catt did some figuring and:
Ok, so the XKCD map printed at 300dpi is around 46 foot / 14 meters wide, half that at magazine 600dpi quality.
Here's a better Google Maps-like way to explore the entire world.