These are not large headphones so there will be some pressure on your head. I have an above average head and enjoy them. The most I have listened to them is 4 hours in an 8 hour work day but I am sure I took them off for at least 15 minutes per hour
Yes, these headphones will work with your TV as long as you have some sort of headphone input available on your TV/AV Reciever. Many cheaper TV sets have standard size headphone jacks, and just about all AV Receivers have 1/4" headphone jacks, and the HD 202's come with a 1/8"-1/4" adapter so they can fit both plugs.
I use a pair of these to drum along to my favorite Rush tunes, and I get pretty sweaty when doing it. Long story short, they haven't quit out on me yet even after using them while drumming and even while blowing snow out of my driveway while it was in fact, snowing.
Of course these are not designed for activities such as running, so they might get uncomfortable after extended periods of time under such use. Although they work well (and IMO are a GREAT value for the quality), I sometimes get ear fatigue after using them for several hours at a time - say, when I am watching a movie solo or something.