Whenever I get the chance, usually every 2 weeks. Although I do make an effort to get it clean if I know I'm going to leave it in the garage for a while. Cant stand the thought of the dirt sitting on the paint for a whole week or two.
I have only polished mine probably 4 times since I got it. Last time was 3 years ago.
d00dz, nice numberplate. The Toyota people will be looking twice at that one