How much use can a MacBook pro take?

Hi
I just received my new MacBook pro 2.4ghz, and it's extremely fast. I have noticed that it gets hot when playing games, or when doing a lot at once. I was just worried, since I don't want to abuse my machine, whether I could keep the computer on for most of the day. I was wondering because, unlike a desktop with many big fans, i was worried whether anything bad could happen by leaving the computer on too long?
thanks for any replies!

i think it's silly how you have to buy a warranty from apple at all. you should get a warranty for atleast a year. there are people like me that save up all summer just to buy a laptop but after all the estimated costs find out that we can't even buy a crappy mouse to go with it or applecare whatever it is called.
anyhow, i have dreamweaver, text pad, messenger, firefox, terminal, photoshop cs3, diablo ii, i tunes, i chat, mail, opera, internet explorer and safari all open right now. no lag whatsoever. i am assuming it can take a lot.

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