Uncollected in only 24 hours and 40 units.
Yes, I finally did it. I completed act 5.1 and 5.2 in only 24 hours. And I only spent 40 units for the final revive on the collector. So for those who think it can't be done, know it can be done, and it can done with only a few units. But beware the collector, as he is the cheapest boss in the history of the game (with the possible exception of 6.2 champion).