1) About 1-2 hours a day (not including listening to music without actually watching the video)
2) Depends on the video, but probably 5-15 minutes
3) skits, fails, gifs, compilations. So yeah, basically compilations of stuff.
4) Nope but I'll say some things I like. TFS, Gifs with sound, All the big animation ones, numberphile and watchmojo
5) Funny, interesting, either mentally stimulating or a good distraction
6) Not really)
7) I don't watch vlogs
8) Perhaps. I'm not interested in lets plays or vlogs, so, yeah xD