Idealistically, at sunset. It feels like a romantic time to CTB. Namely, the sun is going away, and so is my life.
Realistically, late at night., like after 11:00 PM (23:00). I want to buy time for SN to do its thing, before people in my life realize something is amiss. After all, they'll be sleeping. By the time they wake up and start worrying why I'm not answering my phone or replying to texts, my bus will have left many hours ago.