According to Osho, the notion of “a whole lifetime” is a mind-made illusion; you only ever have this single moment. Self-realization isn’t a permanent possession but the art of being still, dispassionate, and centered now. If you master one living moment, you are established; continue moment-by-moment, refusing the mind’s greedy demand for guarantees.
You can’t hold enlightenment forever—just be fully present and quiet in this moment, and keep doing that each moment.