Condition Length

This question may have been asked before, but I can't seem to find a definitive answer for it. So here it is: how long do conditions last if a skill doesn't mention the length? Is there a default length for conditions? This seems like a pretty important strategic question.

Here's an example:
Eruption (Earth Magic)
Cause an eruption at target foe's location. For 5 seconds, foes near this location are struck for 5-28 earth damage each second. When Eruption ends, foes in the area of effect are blinded.
How long are they blinded for?

Or this:
Choking Gas (Wilderness Survival)
For 1-10 seconds, your arrows deal 1-7 more damage and spread Choking Gas on impact. Choking Gas interrupts enemies attempting to cast spells.
How long does choking gas last?

There are other skills that are like these; these are just examples. So, does anyone know?

I would like to know too, add to that list the following spell:

Epidemic
All negative "Conditions" target foe suffers from are spread from target foe to any nearby foes.

How long will it last on the nearby foes? Will it end all on the same time, or will it be "renewed" on the nearby foes?

Choking Gas

http://www.guildwarsguru.com/forum/s...hlight=choking