How long is the recommended duration of using notebooks/laptops?

Hello everyone! I tried to search the site for the answer of my question but I couldn't find one. Can you help me in determining what is the recommended duration of using an Acer Aspire 2920z or any other laptops? Coz I've been using my new laptop for like 12-18 hours everyday. I don't want to wreck it... show more Hello everyone! I tried to search the site for the answer of my question but I couldn't find one. Can you help me in determining what is the recommended duration of using an Acer Aspire 2920z or any other laptops? Coz I've been using my new laptop for like 12-18 hours everyday. I don't want to wreck it or something. Please help me.

And also, I'm using the main power supply while using my laptop, should I take off my batteries?
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