Sorry it took me a while to reply.
I know you'll keep doing it, most would!
Hell thats what we do.. things people tell us not to!
Anyways, you should be fine.
You might have to clean it out more often like every 1-3 months depending on dust build up.
just take a gander inside your case every couple weeks and check if its nasty in there or not, if it is then clean it up.
In my experience with a lot of dust/ash it might be best to take it apart and put it back together after its been dusted and cleaned up.
Whatever the decision is all that matters is you keep it up with the case.
Compressed air cans will help you!
Also keeping your surroundings dust free, not just the computer/computer area will help a ton.