It seems to be legit...
I found this regarding the Hungarian Air Force and it states the following:
In November 1997, Hungary's defense minister announced his country would not be able to meet NATO's requirements for air readiness (more specific the minimum flying time for pilots set at 180-200 hours per year) unless it got new fighter planes. Hungarian pilots flew MiG-29s and MiG-21s for only 50 to 60 hours per year.
So it seems NATO do have that figure in mind, where it states the figure, i have no idea but it's obviously in some publications issued to each member country