So, if we count the bytes in each .h, .s, and .c file what do we get?

find . -iname '*.c' -o -iname '*.h' -o -iname '*.s' -exec wc -c {} \; \
  | ruby -n -e \
    "puts ARGF.reduce(0) { |acc,val| acc + val.split.first.chomp.to_i }"
# 9190080

(12 + 2)  /  300.0 * 9190080 / 12.0 / 5280.0
px font + px kerning / dpi * characters / foot  / mile

Approximately 6.7 miles, maybe?