Traditionally (as in the early buddhist suttas), enlightenment (understood as nibānna) is reached with the permanent cessation of dukkha. A pre-requisite is the destruction of all fetters. So, nibbāna here has really nothing to do with how still is the mind. Moreover, it is not a temporary experience.

The word "enlightenment", though, is used in texts of different schools (buddhist and otherwise) to describe different experiences (eg. "satori").

Traditionally (as in the early buddhist suttas), enlightenment (understood as nibānna) is reached with the permanent cessation of dukkha. A pre-requisite is the destruction of all fetters. So, nibbāna is not a temporary state where the mind is somewhat still.

The word "enlightenment", though, is used in texts of different schools (buddhist and otherwise) to describe different experiences (eg. "satori").