for me, I use up as much H/E as I can, then do the auto thing in game but use AHK to do two clicks in specific places.
1. attack (you don't have to click aab anymore, since it auto saves from the last battle you did now on DMM, and also ends battles when they're over so without having to click [if it's on auto/aab].)
2. next level (11,21,31, etc.)

it'll use up all your AP then you can just reset it.
with those two constant clicks, you can easily have the event done in under a day.