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He died during the Conduit and needed almost 4 rotation for the boss, so potentially there's even quite some time gain possible - although obviously he got an insane streak of awesome crits on the first 5-10 packs or so. And... he's just an amazing player who regularly gets #1 on Challenge Rifts and conquests and everything else that is purely skill-related. But it might help some people, when I saw the time at first I was like "how is this possible?"
I also finished it today in 6:30ish. But to be fair I tried it alot. It's a really difficult challenge.
Also it should be obvious that first you need to get used to the build, which 1) is not everyones taste and 2) is pretty difficult to get into. At least when you wanna be efficient, which you need to be in this CR.
Compared to wudijos original run I think it's better to grab the shield and immediately go the lower pathway in the battlefields. There are 4 elites pretty close with alot of density as well. It's really one big chunk of progress you can make during this period, especially with shield (since I think it's very difficult to survive the battlefields mobtype without it)