FWWC - fatigue recovery at night lower than at day?

[BigDuke66]

Hi
From my tests in other games I know that the recovery value is approximately the value of fatigue you recover.
France14 uses 15 per turn, at night that value is supposed to be double, but night turns are 6 hour turns.
Simple math would be:
3 turns at day = 6 hours = 45
1 turn at night = 6 hours = 30
As I haven't tested it yet, can anyone confirm this?
Cheers