After dinner, what do you do?

1. I watch TV for about an hour.
2. I see TV for about an hour.
[Can we use 'see' instead of 'watch' in this answer?]

No. We don't use # 2,

No, we don't say we "see" TV. I can see my TV on the shelf across the room, but it's not turned on, so I'm not watching a program.

Yes, you can use "see" instead of "watch" in this context. Both verbs can be used interchangeably when referring to the act of watching television. However, it is more common to use "watch TV" rather than "see TV" in everyday conversation.