Just did it for around 20mins on T6 and got over 500million xp, looks good (for now)
i'll add that the champion needs to be kited a fair distance away, my first try i only moved him a few screens away and he teleported back when i engaged the adds.
I'll keep doing it while watching some videos but it's pretty boring and with no gold or regular loot drops if you are geared enough to efficiently run T5/6 bounties i'd recommend them instead if you want to play actively.
i'll add that the champion needs to be kited a fair distance away, my first try i only moved him a few screens away and he teleported back when i engaged the adds.
I'll keep doing it while watching some videos but it's pretty boring and with no gold or regular loot drops if you are geared enough to efficiently run T5/6 bounties i'd recommend them instead if you want to play actively.