Way too much, I use a computer at work and when I go home I'm on my computer until I go to bed. So pretty much the entire time I'm awake I'm usually on a computer. The only time I'm not is the short time I spend visiting my mom on the weekend. But when I'm there I usually play video games. My brother is worse than me, he's always on a computer and spends late nights on one. It's no wonder his eye sight is worse than mine, way worse.