SASless - Exactly - but the case made for NVG invariably is of the "turns night into day" model. Anyone with any experience knows this is not the case.
That said, taking to the night skies without 'em is fairly crazy.
The 15 hrs is the initial qual. followed by around 1:30 per month (for the mil that is). That is the minimum assessed time to fit in all the basic stuff in about 6 sorties.