I know there is a bunch of posts about MOV, but this will probably be faster. So if it runs to time and I've destroyed 54 points of my aponant and he destroyed 0 of mine how would I calculate that?

Assuming a standard 100 point build, you get 154 and he gets 46.

100 plus the Difference in points destroyed to the winner.

100 minus the Difference in points destroyed to the loser.