I played lot of this mode and i pretty enjoy it. It's really runnable and provide shitton of tactics. I propose 3 categories for it:

1. Remaining time only (this will be grindfest)
2. Sum of remaining time and total bonus time
3. Sum of remaining time + remaining bonus time

For every category we have IGT so this would be easy for moderators to verify it.

What you think guys? Cheers Qvaku