I would imagine the disk could get pretty warm after ten minutes. How much stuff do you have around it? You need a minimum of 10" clearance, if not more if you want it to cool properly. That goes for any piece of electronics that generate a good amount of heat.
here is my pic for what it looks like [IMG]http://i33.photobucket.com/albums/d63/killjoy99/5be70579.jpg[/IMG] see im worried tho, i already made a whole in the back but worried if i make it any bigger the shelf my buckle over from the stuff on top

over all i just need a better setup
I keep my Xbox slim running horozontally so it doesn't tip over. That might make for less air flow cause mine gets real hot at the top. I would recommend placing a small fan at the top (I use this one http://images.buzzillions.com/images_products/01/25/caframo-chinook-ac-fan-7-white_9543364_175.jpg) And letting the air blow through the vents.
how much is that?
They run hot, mostly due to the larger side vents. My old one ran just as hot on the back, the difference being that the slim can actually vent the air out.
If you're worried, get one of http://www.gamestop.com/xbox-360/accessories/xbox-360-intercooler-sts/90592
Only issue iv read reviews on amazon and some say its great yet a few have said it caused their slims to extremely over heat O__O
Slims seem to run hot. Got mine a few months ago and it seems to just be how it gets. I have had months with no problems, so I wouldn't be too worried. Then again, I went with a warranty, so if anything happens, I am covered either way.
Ya just worried it will die I mean i got this right when my elite started to die and its odd how it over heats when it has that many fans (assuming the two on the sides and top are fans) and since its slim MS said it Wouldn't over heat right? Yet its super hot, I THINK when i was watching a movie today tho for a good hour it did not over heat as much