Yogi: It is easy to lose the awareness, sometimes for a long time, as I sit longer.
Sayadaw: If you’re sitting for a long time, you need to start checking if you’re aware after 20-30 minutes. Remind yourself frequently if you’re still aware.
The problem is that, if the yogi is more aware of the object than the awareness, they don’t know when the effort decreases and then it is easy for awareness to be lost. That is why the yogi needs to check if the mind is aware or not and keep reminding oneself.
Reminding guides the mind to see the awareness. You can ask: Are you aware? Can you see clearly? How many objects do you know?
Throughout the day, you need to check frequently if you’re aware. Slowly, the mind notices if awareness is working or not.