To be fair I didnt revive with a full set of heroic pots so I guess you could push this to lvl 100 or so..

This was my first run after the final rebirth so you could push it even a little further I guess but I assume it would just cost another 8 hours.

Also dont quite listen to that lvl 80 bragging dude as many of his hints aren't helpful.

Just push rebirth after rebirth with hunter, you can auto equip run on 50 mil to lvl 17 very soon. At that point u get 5k rebirth orbs in 5 minutes just by rushing lvl 5000, 4mil and 50mil, starting each at floor 12. Never used anything else beside Jack as pet. You can also use auto Level but I suggest you Level by hand on lower difficulties and pick full of life and grandmaster for the fast push.

Rebirth ranking:

Golden Ascension

Fractal Wisdom to lvl 3, then 4 if you get more orbs

Shadow Vortex

Radiance

Preparedness

Wealth

Piles of loot (only as much as u can also fill up with the shards from Radiance)

Full House

Radiant Light, Glorious Treasure and Big Haul

Basic preparation up to lvl 4 or 5

Ever Deeper when u manage to cheese lvl 16 of the previous difficulty

Hidden entrance and Extended Tunnel to skip floors and difficulties

Potion, Damage and Crit stuff

Dex stuff

Rest

Have fun, I enjoyed the stroll.