To answer your question: I have done it for 10-20 minutes. I have done it for 30 minutes. And 40. And 45. And 1 hour and half. It is difficult every time. No

To answer your question: I have done it for 10-20 minutes. I have done it for 30 minutes. And 40. And 45. And 1 hour and half. It is difficult every time. No one said this is easy. Over time, I have learned to be able to observe the ... discomfort and "difficulty" as an arising object, and allow that to pass by. I started from having extreme difficulty sitting for 1 minute. As for "easier to accept" -- that is not acceptance. Acceptance is acceptance. There is no easy or hard about it. Thinking that something is "easier to accept" is a subtle form of aversion. Finally, what you talk about with "focus" and "flow of focus" -- that is concentration, that is samadhi. Vipassana is insight, and while it uses a minimum level of concentration, you're not trying to hold a particular focus. You're observing the fundamental nature of reality.