For repeatable quests, I do them again and again until I almost level out of it. Then I save it until whenever I need the quest again XD > edit like what hrae said *O*
@ Ralath
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General comment: I've noticed that while I start off in Abyss and do very little of my quests, as I go closer to the higher x0 level I tend to complete my quests first and then grind in Abyss. After a while even the abyss doesn't seem to make the exp come easy ...