Guild Wars 2

When the duration of boons is extended by traits, skills etc., is the duration extended to one or more decimal places, or is it rounded off.

For example, if you had +20% Protection and cast a 1 second Protection, would its extension be extended to 1.2 seconds?

Yes

Message Body length must at least be 15.

Another question about Boon Duration, does it affect all boons on me, or all boons caused by me? So if I have 30% boon duration, my ally has 0% and I use Hold the Line, will the boons last longer for me, or equal?

Going further, does +Boon Duration increase the duration of boons cast by others? It would be nice to have a little more clarity in the tooltip.

Yes, to every boon on you as far as I tested.

When I get boons in the middle of the zergfest I notice some of them lasting a bit longer than usual, though I’m not sure if it’s because whoever cast on me had +Boon Duration or not... (I did had +10%)

20 to 30% Virtues + Omnom food (20%) = 40% to 50% boon extention

15secs of “Save myself!”, yummy.