My friends 360 5 easy points?

i have two friends that play there 360 all day they play from the time they get home from school to the time they go to bed which at like 2 in the mornin and on weekend ill get on xbox live at 9 in the mornin play for about 30 min then get then get back on bout 1 in the after noon there still on ill call one of them at five their playin it then when i get on bout ten there still playin it at this rate how long will it take them to get that red ring of death thang i can see how ppl play that long and waste a good day their like vampires wont go outside but my question is how long do u think it will take for the red ring of death to hit there xbox