Length of day

I'm sure I haven't searched everywhere, but I haven't been able to find out how long the "day" in SL is. Exactly how long is it from sunrise to sunrise in SL?

Partial answer...I think it is either 4 hours or 6 hours.

The SL day/night cycle is 4 hours of daylight, 1 hour of darkness.

P2

Knowlege base: "Three hours of daytime and one hour of night, meaning in a real-world 24-hour day, there are six Second Life days."

Whoops, 3/1 not 4/1. My bad.

P2

The day is consistantly 4 hours from what I've seen, but the exact times of sunrise / sunset seem to vary by about 10 minutes or so. Apparently there are seasons although I haven't measured the length of a SL year.

You haven't searched in lslwiki.net:

A Second Life day is 4 Earth hours long. 0:00 is midnight and 2:00 is high noon. Sunrise is at approximately 0:30 and sunset around 3:30, which results in 3 hours of daylight and only 1 hour of night-time. Refer to the chart below for PST, PDT and GMT times. There is no guarantee this data is accurate:

Phase PST PDT GMT
Sunset 2:30 AM 3:30 AM 10:30
Midnight 3:00 AM 4:00 AM 11:00
Sunrise 3:30 AM 4:30 AM 11:30
Sunset 6:30 AM 7:30 AM 14:30
Midnight 7:00 AM 8:00 AM 15:00
Sunrise 7:30 AM 8:30 AM 15:30
Sunset 10:30 AM 11:30 AM 18:30
Midnight 11:00 AM 12:00 PM 19:00
Sunrise 11:30 AM 12:30 PM 19:30
Sunset 2:30 PM 3:30 PM 22:30
Midnight 3:00 PM 4:00 PM 23:00
Sunrise 3:30 PM 4:30 PM 23:30
Sunset 6:30 PM 7:30 PM 2:30
Midnight 7:00 PM 8:00 PM 3:00
Sunrise 7:30 PM 8:30 PM 3:30
Sunset 10:30 PM 11:30 PM 6:30
Midnight 11:00 PM 12:00 AM 7:00
Sunrise 11:30 PM 12:30 AM 7:30

More Info: http://lslwiki.net/lslwiki/wakka.php?wakka=llGetSunDirection

Actually, I had, but obviously not with the right serch terms. Thank you very much!