What is your evidence for this claim?
Maybe you should look into some of the third-party sites. That post distance to a station. That ground or space Stations. One site that good is https://eddb.io.
People complain about more than just long transits to stations L, as well you know.
A comprehensive assessment of 'long uneventful transits' would have to include distant bodies, not just stations. Missions send you to uninhabitated bodies etc. That would doubtless affect the 10% you've ended up with there. A reasonable shorthand would probably be to find out how many non-primary stars are 10k ls+ from the primary one.