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The thing about time in the motor I don't think is related to rpm
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It absolutely is related!
Think about the fact that it takes x amount of time for the oil to separate out of the mixture in the lower end as it vaporizes. The faster you move it through (RPM), the less can separate out.
Awhile ago I talked to Jack Bondus about this, who told me about an interesting study conducted using premix oil at different ratios with a radioactive tag. The amount of activity is proportional to the amount of oil, so it could be traced completely through the engine. Results were that the best ratio was around 32:1 - 36:1 for a 250 2-stroke race bike. Next time I talk to him I'll see if he has a link to this as it sounded interesting.