I would say it is about 4.5. But he has great break away speed like Randy Moss since he has long legs (takes up a lot of ground with every step). So once out in open field on a dead sprint, there is no way of catching him.
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original answer is from 4.58 to 4.62 the original answer is wrong. the new and improved answer is Urlacher ran a 4.54 in the nfl combine and in in 2005 bested that at 4.49.