American Football NCAA Rule 3-3-8-b, c

b. For live-televised games only, a charged team timeout shall be 30 seconds plus the five-second referee notification and the 25-second play clock interval. However, the head coach may request that one of the allowed three timeouts in each half be a full timeout. This request should be communicated to the referee when the timeout request is made to the officials. The charged team timeout during an extra period (Rule 3-1-3-h) may be a full timeout, at the request of the head coach.
c. In other than live-televised games, the head coach may request that any charged team timeout be 30 seconds in duration, plus the five-second referee notification and the 25-second play clock interval. The head coach indicates this request visually by touching their hands to their shoulders. The signal must be made promptly after the timeout is requested.