Oh yea, you are talking about that time when it was released for first time. I remember there was exploit. You pull with your group big boss away and kill little adds and each of these adds would drop 1x eof, then kite big boss away until it fleds and resets fight, so adds would respawn and repeat. Yes during that period people farmed hundreds of eof's each every hour. But it was hot fixed withing 4 hours after its realease and GM's changed it so only big bosses would drop eof. But last 2 years of evasion events (2018 and 2019), people was able to farm ~30-40 EOF per hour best, if they would be camping 4-6 bosses, which was almost never the case, since there was multiple 40 man groups competing.