Unless I don't really know how to estimate durations, I noticed that day time in Phantom Pain seems longer than the night. I'm currently still doing the Afghanistan missions.
For example, if the mission starts at night, I have about seven minutes before sunrise.
Seven minutes usually is the time to get S rank.
Are days really longer than nights?
Best Answer
As @twobugs said, night begins at 18:00 and day begins at 06:00. At least, that's the case internally.
In reality, the engine is still rendering the sun at 18:00, and starts rendering it again somewhere between 05:00 and 06:00. That's why daytime appears to last longer than nighttime.
However, even though the sun is already shining brightly at 06:00, enemies still can't see you very well until the engine officially acknowledges sunrise. In other words: As long as Mother Base doesn't say "Sun is about to rise", you can still sneak around as if it were night outside. Daytime and nighttime are therefore equal in length.