I think that would be correct for the Desktop, but in laptops the turbo clock normally(?) does not work for a sufficient long time to give it any meaning.
It does in well-designed machines, although usually not in the ultraslim ones. The ThinkPad T470 can sustain full turbo indefinitely according to notebookcheck. Lenovo's premium line (X1 Carbon/Yoga) cannot, though, as they're too thin and light for a sufficiently capable cooling system, and will throttle after a while.
