This way you can controll the state in which your PC functions, and be able to know information such as CPU temperature, the speed at which you are working or the load voltage in the system.
MSI PC Alert is a software that is designed to monitor the above aspects, but it is not limited to them. The program will also be notified when the levels are dangerously high, and can even shut down the system if necessary to safeguard it.
In this way you will not have to ask any more if it is harmful so long to leave the computer on. Now you know the answer.