When it is.

Yep, that's it, right there.  In my experience if you reduce how you decide that something is true to any one criteria, it's just not enough, it always falls short.  So you take all the clues that you can and decide for yourself.

So it's a decision.

I would also say that long term consequences weigh heavily in my decision making.  I seek to govern myself according to what is ultimately true, and ultimately good.

People can temporarily access some very high rungs on the ladder or circle of awareness, but they refuse to actually live from those levels--they won't actually climb up there.  Their center of gravity remains quite low, even debased.

And if they are to live up to their spiritual experiences, then they will have to grow and develop.  They will have to start the developmental unfolding, the holarchical expansion, the actual inhabiting of the expanding spheres of consciousness. Their center of gravity has to shift--to transform--to these deeper or higher spheres of consciousness...

So you can have a very powerful peak experience... But then days, weeks, months later--where do you carry it?  What happens to this experience? Where does it reside?  Your actual self, your center of gravity, can only accommodate this experience according to its own structure, its own capacity, its own stage of growth.  Spiritual experiences do not allow you to simply bypass the growth and development upon which enduring spiritual realization itself depends.

--paraphrased from Ken Wilber's A BRIEF HISTORY OF EVERYTHING