Computer use-How much is too much

Hi, it is shocking how much time people can spend in front of computer. I am using computer at work, but I like my job. At home my computer is always turned on, I listen to music, play games, and call friends on Skype. I also like to chat and to visit forums on different topics, technical equipment is my favorite anyway. I rarely watch TV, but I also don’t get out of my apartment and barely do any physical activity. I have tried to limit how much time I am spending in front of computer, but all these things seem too tempting to me.