Well, sounds like you fought very efficiently and used the AK scrolls when you needed to. If you had 9 AK scrolls total, that's a lot and is also a rare occurrence, but in any case, they could have indeed gotten you to lvl 60. If you finished halfway to 60, this means you had between 40 and 60k XP left to get there, which is about 15-20 fights with 3k XP bonus from the AK scrolls against heroes.
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