If you are in the slot your nose would be on or very near the inside corner. With the plate being 17 inches wide you would then need a face that is about 34 inches wide.
Actually, it's 32.
Anyway...
I should've been more descriptive when saying it was outside to mean that it was away from me and not wide of the plate. Regardless, it was a crappy pitch that hit me. Bonk.