Zones in the world follow a day / night cycle that does not follow real time. How does it work? Does it have any effect besides the visuals?
My source (via the Wiki) for this is in French, but it should work something like this:
Are they going to include a day/night cycle?
Yes. The cycle will be faster than real time. Events and monster spawning will change based on the time of day. Centaurs might attack a camp at dawn, and ghosts haunting an ancient battlefield might only be visible at night. Currently, the cycle lasts 2 hours with 80 minutes of day and 40 minutes of night, but this is subject to change before release.
Sylvari glow at night.