Im only allowed to play videogames for an hour a day?

I am 13 and I'm on summer break right now. My family isn't going on vacation because i play summer baseball. I do summer reading for my school and I do my chores and I help out around the house a lot.(When I mean a lot, i mean like 3 hours a day.) I have an xbox360 and I'm only allowed to play an hour a day and my parents get mad if i play for consecutive days. I just want to play for like 2 hours like 3 days a week. Thats 6 hours a week. That really isn't that much compared to all my other activities. I have baseball practice for 2 hours everyday and tournaments all day Fri-Sun. I get really bored. My parents don't care if I sit in front of a computer for 4 hours straight just checking my facebook and email. They just don't seem to like xbox. Could it be M games that are annoying them. I've been playing violent games ever since i was like 8. I don't understand why i can't play for a little while during the summer. On regular school weeks, I am only allowed to play Saturday and Sunday for and hour. I go to Japanese school on Saturdays from 9:00 to 3:00. I have homework for that too. I am never "free" from school work. I go to the number 1 school in the southeast.