If your everyday riding includes communtering and what not, then every 6 months for oil, and oil+filter every 12.
If you're a "weekend warrior" or fairweather rider, then go by the kilometreage, and do it every 6000km or whatever your bike manufacturer recommends.
Oh - and I dunno what mileage the VFR's done; odo says 5x,xxx miles, but it's a lying scoundrel, and shy of about 3 or 4,000 miles at least.
VFR's just lightly run in - I know of other ones that have done up to 850,000 MILEs, and many in the US of Mrka that have high 6-figure sums.
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