Running Time and Connected Noises

I am wondering if there is a maximum time limit I should run my laptop, because it gets really hot on the bottom and today it is making funny humming noises like something behind the speakers is vibrating. I think that it's because I used it to aggressively for too long yesterday, but it was only abou 2 or 3 hours. Does anyone have some good insight for the problem?

Hi, Liza. Welcome to the Discussions.
Your question is really hardware-related and should be posted on the MacBook Pro Discussion.
The humming noise may simply be the cooling fans running. The MacBook Pro has been notorious for heat.
If you find the bottom is hot because you are using the Mac on your lap, note that laptops are not designed for laps, which is probably why Apple calls them "portables." You can't use a laptop ergonomically with it sitting on your lap. This can also prohibit proper airflow for cooling of the laptop.
Your laptop should be placed on a smooth, hard surface while in use, e.g. a desk or table at the proper height for correct ergonomics. If you ignore proper ergonomics, you risk injuries such as Carpal Tunnel Syndrome.
Likewise, if you use the laptop on a soft surface, it can "sink in" a bit and, depending on the model, block the airflow for cooling. For example, if you use it on a table, no tablecloth should be under the laptop.
You can learn more about proper ergonomics at Apple's Ergonomics Site.
There are Apple Retail Stores in Durham and Charlotte, so if you're near one of those, you might want to take it there for a checkup. Call ahead to make an appointment at the Genius Bar.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X

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