I check my pump intake at least twice a week. Usually I can get any gunk out with my finger, without needing to unscrew the cover and open it up.
But now that my koi are separated from the plants, I get MUCH less gunk in the pump...have not had to clean it since I redid the pond two or three months ago.
I bet you have extended the life of your pump, too, 'Vetts, because it is straining less, now that it's unclogged.