Extra data:
20-60 was 6 hours and 45 seconds, previously on live the same route took 9 hours and 2 minutes and 25 seconds or so.
For 70-80 it took 2 hours and 59 minutes, but I expect 30-40 minutes can be taken off of that with Amp and Ring of blood.
I found one rare mob in red ridge that showed up as a star on the map. No other rares showed as a star. There are apparently treasure chests that give XP in vanilla content. Dark Iron chests, sturdy chests, and similar chests all give a quests worth of experience (I factored around this appropriately to create a realistic time stamp, skipping a few quests to compensate for my live run)
I do not plan to do any additional PTR leveling. I think sinking 11 hours into this is enough to showcase the drastic changes to leveling (and quite positive I might add).
I anticipate 20-120 should take 34 hours now as a warrior/monk.
Another thing to include is, the 20-60 here was done in one day, my 9 hour run on live was done over 6 days.
Edit:
For those asking, you can find all the information you could want about leveling on my profile
u/DesMephisto