Where does the 'feet' come into equation? You carry the ball with your hands right? Get tackled whilst carrying the ball with hands right?, pass the ball via throwing with your hands right?
Which would add up to about apox. 1/3 of a second per game. So OK math is not your strong suit. Field goals also make up from 10% to 30% of the scoring in most games.
Also in the above posted picture how many of us guys are actually looking at feet.