Keep in mind that in this forum, you're not likely to get information on what's typical.

My DD was able to watch an entire 20-minute TV show as an infant.

I'm not sure of the date, but I know she was definitely not older than 2.5 when we took her to see a Disney on Ice presentation. She was absolutely transfixed, and completely speechless, from the beginning through the intermission. She maintained her focus on the second half, though she recovered her powers of speech. I have to think it was at least an hour for each segment.