no problem...
well from my personal experience its good to blow-off all the dust from the air filters... The main aim of the filter is to basically provide purest breathing to the engine possible. If its all covered by think layers of dust... it would be hard for engine to breath freely, as a result it wont have the spark/ feel/ lightness...
i usually do it every second week since i drive in a very dusty roads...
However i change the filers on every service whenever possible ... usually max 5k...