Where is boon duration now?
its inside most or some traits now , the rangers boon durations
can’t remember the name but it gives the ranger 20% boon durations and the pet 50% boon durations so i guess Boon duration will no longer available , only when you have the trait and or slot some boon duration gear items.
unless Anet have other things in mind for the masteries they might give you options to increase boon durations by Specalising in them by spending your points after lvl 80.