I do have pets I play on my computer a lot maybe for 10 hours a day , but is up on a desk, I ask my tech friend he said your good for 6 months maybe 4 due to the fact that it’s up on desk, and also the fact that it takes a lot of dust to make tempz higher and to have a decrease in performanceThat will vary.
if you run it 24/7 and don't have pets, about every 3 months. If you have pets it could be every month.
If you only turn it on a couple hours a day it could be every 6 months.
There are way too many variables to give an exact time when your computer will need dusting on the inside.
This also depends on the case you have.I do have pets I play on my computer a lot maybe for 10 hours a day , but is up on a desk, I ask my tech friend he said your good for 6 months maybe 4 due to the fact that it’s up on desk, and also the fact that it takes a lot of dust to make tempz higher and to have a decrease in performance