It scales until lv80. More specifically, until level 80, enemies and EXP will scale to the level you are when you start the Quest (ie. if you go in at lv70, they will stay at lv70 until the end of the Bonus Quest, even if you reach lv73 before the end of it); once you hit level 80, enemies will stay at level 80 and give the same EXP regardless of your level.
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