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So, what's the question?
My understanding is that the oil "full line" is at the point where the crank/rods will not dip into the pool of oil as they rotate. So, overfilling is bad because, as the crank and rods turn, they will dip into the standing pool of oil and churn it, creating an oily froth. I suppose this is not great for the oil due to excess shearing(?). Additionally, when starting the bike, the crank has to trudge through cold, thick oil, if it is overfilled. This causes undue resistance/stress to the crank bearings.
Having said this, I don't think 2 weeks is long enough to do any harm. It might be a different story if a bike is ran like this for, say, years.
Again, this is my understanding (which may not be correct). I wish the engineers would get together with the people who write the manuals and explain the reasoning behind some of the rules/warnings.
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