I assume you’re concerned about the mileage...
I have had my 690 from 9000km. Have done many long trips and have only had a handful of issues at the beginning (dirty fuel, broken seat, broken speedo etc.)
I service it regularly and have done some preventative maintenance including upgrading the rocker arms, can tensioner and now have over 30,000km on it. I feel it’s more reliable now than ever. I just don’t have issues with it. There are plenty of story’s of guys do 100,000km on these bikes no problem- they are fairly over engineered.
That being said if it hasn’t been looked after it will be another story. But to sort out a top end on a bike like this is fairly strait forward and not that expensive relatively speaking.