American Football NCAA Rule 3-1-3-h

h. Timeouts.
Each team shall be allowed one timeout for each extra period. (Rule 3-3-7) Timeouts not used during the regulation periods may not be carried over into the extra period(s). Unused extra-period timeouts may not be carried over to other extra periods. Timeouts between periods shall be charged to the succeeding period. Radio and television timeouts are permitted only between extra periods (first and second, second and third, etc.). Charged team timeouts may not be extended for radio and television purposes. The extra period(s) begins when the ball is first snapped. In the absence of a media timeout, after the second and fourth extra period, there will be a two minute mandatory break period.