How long I may turn my laptop on?

Depends a lot on the cooling system. Getting a heat disapeating pad for it can help a lot. As can blowing the dust out. Make sure you have a screen blanker set as well. I have had some laptops running 24/7 for over five years now, and another that can't stay on for over four hours without overheating (damn nvidia's defective chips a couple of years back).

Hiii friend...I am also using the acer laptop..acer was the good laptop..No problem for you..You taking security steps that is you are placing your laptop in the airconditioner room and also you are placing a cooler fan down the laptop..So that no problem if u use yoyr laptop for 12 hours per day...And also one thing i have to tell for acer heat will be more so better to keep continuosly in the airconditioner room when you are usig ur laptop..I am using my acer laptop from 4 years it was working nicely only...I will also keep working with my laptop for more than 10 hours no problem..happy mylotting dear friend have a nice day..keep smiling..

I think you are asking about how long you should keep your laptop on before giving it a rest? Well, it doesn't really matter how long just as long as you are meeting the cooling requirements and it does sound as though you are doing this. If your laptop overheats then you will certainly know about it as it will shut down automatically allowing the laptop to cool down by itself before it can be used again. They sell these cooling plates that you can purchase and you basically rest the laptop on top of this whilst you are using it. This plate has two to three cooling fans on it so it does the job of keeping the laptop cool. I wouldn't worry too much about the status of your laptop as regards whether it is overheating or not. I think you are doing ok at present by the sounds of things! Andrew