I've walked around great museums and seen great pieces of work. After seeing a few of them as I walk, I walk faster and spend about as much time on most of them as I would on a photo - just a few seconds. If the art moves me, I spend more time looking. If not, I brush right past it. Same as with photos. Art tingles our aesthetic ganglia. But one piece of anything wears thin. Frankly, if you want to compare art types, you spend a heck of a lot more time listening to one song by one artist than looking at any piece of art or photo you've ever seen. Of course music, dance, movie, books, etc are linear, like a video, not like a photo which is singular. Unless you have to write a critique on a photo or painting, who spends more than a few seconds looking, regardless how great the art is?