It depends on how much oil you're bowling on and how much care you take of your balls between that 2 week point. The green nylon pad is considered to be about 600 grit, which is fairly rough for such a strong ball, but you may need it.

Basically, this procedure will help remove some of the oil that the ball absorbs during use and the green pad will help keep the ball at 600 grit.

My opinion is that unless you are never wiping your ball off each time or even between uses, this is slightly too often. I mean you should be wiping your ball each time you throw it to help prevent it from absorbing too much oil  and if you're bowlign in that much oil, you should give it a light cleaning preferably after each use, but at least before each use. If you do that, I think you can do the Clean 'n' Dull + green pad routine once a month or once every 6 weeks.

A ball won't lose its 600 grit finish very quickly. In fact, most lane surfaces are considered to get a ball to about 600 grit.

Yes, you should use a spinner to insure an even coating, but then you are not or shouldn't try to grind that green pad into the ball's surface. An even, medium-light pressure should suffice to both get the C 'n' Dull somewhat into the pores and also to keep the ball at 600 grit.

--------------------
"We get old too fast, and too late, smart."