Good morning, my friends.
I don't want to be disrespectful - and I know you know that, hehehehe -, but, in order to discuss about what was said in that topic, I'm going to say what I (or my ego, hehehehe) think about it.
I think that "enlightenment" is a word in english-language that, in our context, is used to describe an "idea" (as all the words and languages as well). Usually that word is an idea similar to a "light switch" thing, or similar to "cross some line" involving presence/non-dualism. So, it's also a form, a creation of mind, and can generates attachment.
In my (or my ego's) opinion - and with all the respect -, it is false
that some day (independently if was a long progress or was an overnight thing) a person just "wokes" and, after that, that person stays in that stage without coming back. Even if the person is indeed a great master, for me, this is just another story.
I guess we can use the word enlightenment to refer to a stage where the person pass a long
of his/her time in the present moment; but will never be something that occurs 100% of her/his time. It's not, in my opinion, a light switch. In fact, if I'm not wrong, some zen teacher in the past said that if someone pass more than 50% of his moments of perception in the present moment, that person is enlightenment.
Language and words are forms. So, even masters as Tolle (that I admire so much, by the way) can, sometimes, not being present. Although a lot of them can be present for long time - and that's wonderful! -, I think there is a lot of "romantic creations/interpretions" about this. Ironically we create concepts about something that shows to the limits about concepts, hehehehe.
For me, there is no such thing as "now I crossed some line and I'm enlightenment." I think we can be enlightenment every moment if we are present, and we can't be enlightenment every moment if we are not present.
This path is wonderul, beautiful and magic by his own. We don't have to create stories about what it is. For me, we just have to drop everything (including concepts and ideas about this) and be here and now.