Совсем короткий, просто как ответ на вопрос:
As for me, computer is the great part of our modern world. It makes human's life easier. Speaking about me, it helps me to search all the new information I need. For example, I watch new movies and films, listen to music, playing games, doing my homework...And all these activities I do using my computer!
Speaking about the time, I use it every day. Of cause, it isn't good for my eyes, so I try not to do it more than 3-4 hours a day.