Chain lube frequency?

[ridesalot_imp]

I lube my chains between 300 and 500 miles when I remember the need. In the past I used Bel Ray Super Clean but lately I have been using the Dupont General Purpose Teflon. The Bel Ray worked well providing good chain life but I noticed that grit would accumulate in the lub. I cleaned it with kerosene (which I believe is a light weight oil and not a solvent like gasoline) dried it with a rag and relubed it. I switched to the Dupont lub after seeing others use it and noticed how their chains always looked clean with no accumulation of grit. The Dupont leaves a clear thin coating of lub on the chain. As to longevity, some of our local MSTA (Motorcycle Sport Touring Association) members are using it with good success. One VStrom 1000 rider got 30,000+ miles out of his chain. Another Yamaha FZ6 rider got 50,000+ out of hers! Well, in the final analysis I don't think it matters too much which system you use as long as you keep the chain clean and lubed. I guess I am looking for the least messy method.