Guild Wars 2

I timed this on my stopwatch and was consistenly getting 6 seconds burn duration, when it should be 3 × 1.15 (2 piece Bonus effect) X 1.1 (had a weapon of smoldering) X 1.1 (another weapon of smoldering) =
4.17 second burn. Because I used a stopwatch there would be a margin of error, but likely not an almost 2 second error. I did not have any traited points in condition duration, and even if I did have +30% it still would only be about 5.4 second burn all together.

(1): +25 Power
(2): +15% Burning Duration
(3): +50 Power
(4): Gain haste for 5 seconds when you fall below 20% health. (Cooldown: 90s)
(5): +90 Power
(6): When you use a healing skill, nearby foes are burned for 3 seconds. (Cooldown: 10s)

On another note, I’m pretty sure that the duration increases stack multiplicitavely, but if they are additively stacked then I’d like to know. I don’t think that’s the case though, because then the duration would be even lower.