I can't wait until you spend.. Oh I don't know.. 7 runs.. So that's probably without wipes of course 7 hours? 7 and a half hours if you're using duty finder for sure just to cap your Myth a WEEK.
You're literally spending 90% of that time either clearing trash mobs or wiping to the wall. And that 7 hours is being generous, so many people still don't understand that boss fight that it's completely beyond me.
I've watched someone do a run like this on twitch. Not against this at all. Once you play the dungeon at it's entirety 5 times, you tend to get a little bit bored of it.