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If you were within the first 10 PK counts and were farming the top XP mobs - maybe a few to a dozen mobs?
Ideally you'd even let your PKer leave the party real quick and kill a few mobs solo, just so that he got the max XP possible and removed karma faster.
Considering mob amounts and respawns, it'd usually take 2-3 mins, if your party was clearing the whole room within 1-1.5 mins. And it would take the dead party 2-3 mins to return to the same place in the dungeon if they were super well cooperated and just booked it right from the TP location to the room. So if your own party was somewhat weak, while the victim party was strong - they might've come back before you cleansed your corruption. Same would happen if you were on higher counts of PKs.
Though again, this was somewhat rare, because you'd usually just have warring guilds which were just a ffa, so any given room was a revolving door of parties that were constantly killing each other.
I'd personally want a roughly same timeframe for AoC's corruption cleansing and victim returnal. Your first PK of an equally-lvled player deep in the best XP dungeon should give you the amount of corruption that would take the same amount of time to clear on those mobs as the time required for your victim to return to the same place from their spawn location. The returnal time would have to account for whether you can use a mount in the dungeon, of course.
I feel like this is the fairest way to go about the system. Your first PK is barely punishable. Your second can already be punished by the victim themselves. And higher count of PKs would give even the BHs outside of the dungeon enough time to come hunt you. And if you just so happen to be a disliked person or a member of a disliked guild - even your first PK might be punished by other green players in rooms nearby, if your victim shouts to them about you.
And that last point is my biggest argument for the system remaining just as it is. Green not flagging against reds is way more social. You going red gives any green around you an outlet for their "sense of justice". It'd still be their choice whether to give up their farm and risk their loot or to just let the victim deal with you.
And again, I'm talking in the context of party farming, not solo. Stopping your farm to kill a PKer as a solo player is quite easy and fast, but convincing your whole party that this one PKer is worth several minutes of their farm, potential loss of the farming location (cause someone might take your place in your absence) AND potential death on top of that - now that's a whole different story. At which point there's a higher chance that a BH can go and try dealing with the PKer. Obviously there's a chance that having a BH in each party will be the meta, but that just means that there's enough PKers to justify that, which means that PKing is not as harshly punished as it might seem rn, which means there's quite a lot of forced pvp on top of guild/node-based one - and all of that sounds super fun to me, as a pvper.