Usually when a laptop is overheating in 30 minutes no matter what you are doing something inside is broken, could be fans, could be your CPU not throttling. If your laptop is just being pushed too hard, like it is old and you are trying to play super games with 5 FPS, it can be kept cool with some simple and obvious tricks: Keep your room cold, buy a house-hold fan and point it at your laptop, and get a laptop fan that your laptop sits on.