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Originally Posted by TripleDuck
250 is no problem - even if the temp gauge was accurate (which most are not). Newer engines and oil are designed for much higher temperatures. I wouldn't be concerned untill ~280F.
See if you can get your hands on an IR pyrometer and find out what the real temperature is when your gage is reading 250.
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Oil life is shortened as the temp goes up. I had an air-cooled Suzuki (with a built-up engine) that would push the oil up to 320F under really bad conditions. It would drop back down to 210F but it would take 20 minutes of open road riding to get there.
When it happened - I just made a mental note of it and changed the oil a little sooner. And I used a good synthetic oil.