American Football NCAA Rule 3-3-5-f

f. Ten-Second Runoff. If the player injury is the only reason for stopping the clock (other than that player’s helmet or a teammate’s helmet coming off, Rule 3-3-9) with less than one minute in the half, the opponent has the option of a 10-second runoff.
1. The play clock will be set at 40 seconds for an injury to a player of the defensive team and at 25 seconds for an injury to a player of the offensive team (Rule 3-2-4-c-4).
2. If there is a 10-second runoff the game clock will start on the referee’s signal. If there is no 10-second runoff the game clock will start on the snap.
3. The 10-second runoff may be avoided by the use of a charged team timeout if available.
4. There is no option of a 10-second runoff if there are injuries to opposing players. (A.R. 3-3-5-VIII and IX)