Ignore post above as this one answers the time elapsed question.
In reality it should be running fully synthetic oil and therefore it shouldn't really be a problem to add some mileage to it.
Even highly stressed bikes have 20,000km service intervals in some cases these days due to the oil technology.
But it's still stupid and goes against what the book says.
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I would argue that changing the oil yourself is a user serviceable part and shouldn't affect your warranty.
At the same time I would argue that ignoring a service light indicator willfully is a breach of the very same warranty terms, even if supported by the dealership to do so.
Any time lights are flashing on your dashboard is an indication that something is wrong.