In post-season play, 17 seconds by the San Diego Chargers. January 11th 2008 vs. the Pittsburgh Steelers.
The answer you are looking for is Darren Sproles At 5'6"
Jack Shapiro at 5 ft 1/2 inch is the shortest white player ( and shortest player) in NFL history
The shortest game in NFL history lasted 40 minutes 40 seconds. It took place in 1996 with the Kansas City Chiefs beating the Chicago Bears 14-10. The game was called because of lightning and thunder with 4:20 left on the clock in the third quarter.