How long is a day/night?

How long is a day/night?

Yo. Just wanna know cause im making a game based on day/night cycle. How long is 1 night, in real-time (seconds). I want to make a night take 40-50 minutes, by using

[set time of day speed to ?% of the default speed]

Anyone who knows? (checked blizzards site, nothing said about real time there)

under advanced > gameplay constants there should be some fields labeled as "Time - Dawn" "Time - Dusk" "Time - Hours Per Day" "Time - Real seconds per game day"
if you scroll all the way to the bottom you'll see them.