Guild Wars 2

How do the condition duration sigils work when stacked? For example, I have a greatsword with Superior Sigil of Peril and my second weapon set is a sword and focus both with Superior Sigil of Peril.

Do those sigils stack or will I only see a 10% increase in duration?

Do the sigils stack all the time for all three weapons or only for the weapon I currently have out?

How would the duration be affected by weapon swapping?

If they do stack the duration how would that be calculated?

I also have the same question about the Sigil of Force.

Thank you.

Just want to move this back towards the top, its getting some views but no responses.