Context:  Coming off their bye week, the Bears flew to the Rogers Centre for their Week 9 interconference duel with the winless Buffalo Bills.  After a scoreless first quarter, Chicago delivered the opening strike in the second quarter as quarterback Jay Cutler found tight end Greg Olsen on a 4-yard touchdown pass.  The Bills responded with quarterback Ryan Fitzpatrick completing a 14-yard touchdown pass to wide receiver Roscoe Parrish. The Bears regained the lead in the third quarter with a 1-yard touchdown run from running back Chester Taylor.  Buffalo answered with running back Fred Jackson getting a 4-yard touchdown run (with a blocked extra point).  Chicago trailed in the fourth quarter as fullback Corey McIntyre got a 1-yard touchdown run, yet they came right back as Cutler found wide receiver Earl Bennett on a 2-yard touchdown pass, followed by a successful two-point conversion pass to running back Matt Fort&#233;. The Bears would eventually take the win as a Fitzpatrick throw was intercepted by cornerback Tim Jennings.

Question: How many yards was the longest touchdown run?

Answer:
4