How Often?

I agree with Barbie; When I used a desk top computer, I lived in the city, right in the city center. Sometimes my windows were open. I managed to keep the dust down by blowing it out once a month. A good way to tell when it is near time or time to clean the inside of your computer, to free from dust is to look at the fan in the power supply. The dust build up there is a great indicator to what is going on inside.

I will be keeping a cloth in my computer table and then and there I will be wiping the system, if I find dusty. It is a matter of less than a minute . I will clean at least the monitor , the keyboard and the table top at least once in a day.

I bought my computer eight years ago. I never blow the dust inside out. I found the inside of my computer is not so dirty though I live near a street and our windows often keep open. I dare not clean the components inside with specific tools in case they may be damamged. My computer has worked very fine for me for eight years. The dust never caused any trouble for me!