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Just hit level 40 tonight. 39-40 in grinding party requires about 12 hours non stop.
I am expecting 40-41 about 11-12 hours per level from now on. Not as bad as lineage 2.
I noticed that fro level 35 the hours for party grinding increased about 1.5 hours.
so from level 36 you have to grind mobs about 8 hours non stop per level.