I grind for most champs in the 4* basic, unless I have them duped. for new champs like terrax or mojo recently, I go like 2.3 or a little more to be safe. unless it's someone like doom, in which case grind like crazy. I think I grinded over 3 mil for him and got my highest pvp win streak thing from that
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unless considered to be a top-level champ then a little more.
I did 161 rounds for a 4* x23 dupe a couple of years ago lol.