Got it down to ~90 mins. Could cut some more time since I had 4 defeats.
One defeat is actually faster though. On the third intermission of Dr Zeon and Midas, if you move Zeon way out from the circle, then die, when you come back, he'll still be there but Midas will have moved back to his spawn and will be too far away to aggro.
There's so many D-Syncs that the chances of getting the good one is too low. I'll probably call this experiment over.