Last year, TAPPS started an 11-man mercy rule for games involving TAPPS schools (it probably wouldn't apply if you were playing a non-TAPPS member school).
Section 158-H MERCY RULE - 11 MAN FOOTBALL
1. In the event the score differential of an 11 MAN FOOTBALL contest reaches 40 or more points, the following provisions are to be implemented.
2. First half time keeping will not be affected.
3. After half time, once the 40 point differential is reached, the Clock will run continuously except for the following stoppages:
a. Time Outs
b. Quarter End
c. Injury Time Outs
4. Once the Continuous Clock has begun, time keeping does not revert back to normal procedures even if the point differential is reduced to below 40 points