hmmmm, using some basic 3rd grade math:
1,000,000 sides of music @ 4 minutes each side ( I know... a little obsessive for my 3 part cleaning process with the disc doctor) gives us 4 million minutes of cleaning ( not including the time to rinse out brushes, and draining used fluid, and putting the albums back, etc.)
so that's 4mil minutes/ 60min/hr gives us 66,666.7 hrs or 2777.8 days or
7.6 yrs of cleaning