I share your interest. To speed up a process, I usually try to identify the rate-limiting step (the constraint.) I would guess that one of the factors that af

I share your interest. To speed up a process, I usually try to identify the rate-limiting step (the constraint.) I would guess that one of the factors that affects the time required to see through the illusion of a separate, egoic self, is "How badly do you want a much better existence than the one you've been living?" Invalidating a low-level assumption of the kind we are discussing has to trigger a lot of re-evaluation by a person. In other words, it really turns everything on its head. I think people are often very smart, in a sub-conscious way, and they can see where self-inquiry might lead, and they say to themselves, in essence, "Screw that. Too scary!" On the other hand, if you're really suffering, you'll probably pay a high price to escape it.