The color of the oil isn't necessarily an indicator of it's 'life', only a used oil analysis can do that.
My 'advice' would be to not exceed the OEM recommendations. Though Amsoil markets that you can run 2x OEM recommendations, up to 12 months. Lots of people do that without problems.
As for me? I do it about every 5k, so it works out to be about 4 times a season. I change the filter each time. She runs good, runs cool, shifts smooth, can't complain!
"8 But God demonstrates his own love for us in this: While we were still sinners, Christ died for us."
Romans 5:8 (NIV)
2014 Kawasaki Vulcan 1700 Vaquero ABS SE
iPod Connector Kit, Kuryakyn Highway Pegs, Mustang Touring Seat, Marvella's Hitch, Kuryakyn Trailer Wiring Kit, Haul-Master Tag-a-Long Cargo Trailer
2011 Honda Shadow Aero 750 (Wife's)
Memphis shades quick-release windshield, OEM Solo Seat, Mustang Fender Bib, Chrome Solo Luggage Rack
Past: 2006 Vulcan 900 Classic LT