Mооnst@r
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What difficulty level did you play on? After all, 53 days is very fast for this scenario.
On a hero.
I replayed it recently and improved the result to 49 days; I could have done it even faster, but I collected all the stat boosts. If you're interested, here's a recording of the battle with Lorenzo. The file contains a description of which day it is, what artifacts are used, and the hero's progression.
P.S. I lost the data (email and password) from my previous account, Moonst@r; this is a different account, please don't ban me.