My laptop has been on for a year and a half or so minus restarting every once and a while and transporting it. But for the most part its constantly on and i havent had any problems with anything melting down, although it does get pretty hot. My advice would be to yes, get a notebook cooler or check to see that any dust isnt in there. I just cleaned my fan out from it running on furniture and my lap and such it collected pet hair and dust and all that. Just blow into the vents a couple times and if you see anything move pick it out with tweezera, although i tore my whole notebook down to the motherboard and cleaned it all out. I usually do that about every 6 months when i also debug and reformat my computer.
