That is as gray as it comes ,

how is it possible to be neither on duty nor at rest ? is it pilot purgatory ?

I'm not saying I agree with it, but it is an accepted practice and has been for a long time and until the FAA comes strait out and says " On call is on duty " it will continue to be that way.

what other rule has so much confusion and ambiguity, they say you must have a clean wing PERIOD, you must have the Vis, there are no questions and people can't get around it