How Long Should Your Mind Be Silent?

Nanda otma is a process of removing all those encumbrances. When you remove all that mental fluff, the only thing left is your true nature. For how long should your mind be silent? You get it. It doesn't take an hour. If you look in a mirror, how long does it take to recognize that it's you? It's instantaneously. Even a few moments of silence in meditation is enough.