1. It depends. Are you watching YouTube, or hard core gaming with a dedicated graphics card?
2. It depends. Is your TV 24” or 85”?
3. No. There is only a 120V 150W outlet and two USB ports totaling 4.2A. There is no 12V outlet in the advertising material.
The trend here is “it depends on what you’re doing with it”. The more power you draw the less time it lasts. This is a question without an answer, however Ego has given very generic examples in the product manual.