NFL Rules.. No untimed down ???

[APG]

Originally Posted by JRutledge

As a matter of fact under the last two minutes there is a 10 second run off for any offensive penalty (not sure if that applies for a team leading too).

Not exactly true.

Rule 4, Section 7, Article 1
Actions To Conserve Time

A team is not permitted to conserve time inside of one minute of either half by committing any of the following acts:

(a) a foul by either team that prevents the snap (i.e., false start, encroachment, etc.)
(b) intentional grounding
(c) an illegal forward pass thrown from beyond the line of scrimmage
(d) throwing a backwards pass out of bounds
(e) spiking or throwing the ball in the field of play after a down as ended, except after a touchdown; or
(f) any other intentional foul that causes the clock to stop

Penalty: For illegally conserving time: loss of five yards unless a larger distance penalty is applicable.