It depends on the cat so I can't really vote.
Blacky does everything outside.
Blaze doesn't pee in his two litterboxes so I don't feel compelled to clean them daily. Newspaper on the wall gets changed, though...
For the cat in the garage I clean the litterbox twice daily, morning and night. I might scale back to once a day in a week or two after I can stop looking for disasters in there (he was just neutered and could - although unlikely - have worms).
Last edited by Carmel; 11-23-2012 at 09:48 PM.