How long does a Nascar truck race usually last?

[JoshW]

I have to be near the track this Saturday in Kansas City for something not related to the race, but I am trying to avoid the traffic. Race starts at 3pm according to Nascar site. Is 250 mile race. Anyone want to guess how long it lasts? Sort of off topic, but figure someone here might know.

[Willie Bee]

Looks like they averaged about 110 MPH in the race they ran last week in Milwaukee. Not sure if that's the norm or not.