Four hours is prime time. It won't be too tired and the time is not particularly short. You can choose to broadcast live during the evening rush hour and send a video before the live broadcast. These are some tips for live broadcast.
Usually ten o'clock in the morning is the highest point of exposure. At this time, most people have already got up, and 2 pm is the highest point of exposure, not lunch break. The highest point of exposure at night is 10 at night, which is the bedtime for most people.