This is my total experience between all 3 most used characters who all have eternal 99.
Altogether a total of Trillion Experience.
Experience boosts were there but those boosts came from collecting 3750 orbs (5000 if you don't have accomplished perk from ascension) , EXP shrine and sometimes clicking ad boosts intentionally or not.
But I don't actually try to gain a lot of experience.
Just so you know, eternal 99 requires a total of 150B experience or 190B. It's around the 150B-200B range.
My wizard has the most experience and name is CuzegSpiked. My warrior is second in line named Michael since I use that warrior everyday for farming with my wizard so they get similar values.
My rogue Lucifer is only 160B since she only got eternal 99 and hunted high floor afterwards so I didn't use her much ,except for PvP.