Just realized the timing rules are different than what I used back when I did this. It'll be a bit slower since I stopped the run after the final kill rather than the congratulations screen

16:45 I think would be the correct time?

It shouldn't, I'll have to do more testing to see if the total health of the fight changes or just the way it is distributed throughout the enemy team

I just did some quick testing and it looks like the enemies health is randomized to some degree. I don't know how large the differences are or if they could have any real impact on game play, has anyone else noticed this?