I can't help you with specifics on the trail in Kilarney. That being said, I've read a number of backpack trip planning articles and they said to plan on 3km per hour of travel over varied terrain. Obviously this averages out over a long distance. So expect to go slower on more challenging sections with lots of hill climbing, and faster on flatter easier sections of the trail.
Have fun on your trip.
Cheers
Brian
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