Ideal time for a laptop to stay on

@Ramaditya (1227)
September 12, 2010 8:56am CST
Everyday I use my laptop to type and convert audio / video. I spend around 12 hours per day. My question is; how long a laptop can ideally stay on? For your information, I put my laptop in a room equipped with air conditioner, and I put a cooling fan under my laptop.
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