Does putting points into the boon duration trait tree increase the boon duration of abilities you apply to allies? Or is that only based on their own boon duration buffs? Also is it the same for things like food/runes/whatever?
Boon duration affects all boons that you give, so yes it affects allies.
http://wiki.guildwars2.com/wiki/Boon_Duration#Related_items
It doesn’t effect food
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