According to AA description, extended quicktime adds 10% to the duration. I trained it, and it went from a duration of 3 mins 13 seconds before purchasing the AA to 3 mins 19 seconds afterwards. That certainly isn't a 10% duration boost: it's one tick. Either refund the players who purchased it, or fix it to actually add 10% duration. I want to return this skill. I have a receipt!
I'm not a bard, but I know all AAs work off the base level of abilities. Do you have gear, abilities, or other AAs that are also effecting the duration? Because none of those would get multiplied
Lucy shows its base duration being 2.0 mins. 10% of that should be 12 seconds so he is correct it is only a 5% duration boost.