Gotta agree with Uber on this one.
The difference between the limit (normal ~3.8) and the ultimate LF (+50%) might apply when the aircraft is new, but metal has memory and every time it gets flexed back and forth (ie by exceeding Va in bumpy stuff aka overstressing the airframe), it weakens just a bit further.
How long until the ultimate LF is equal to the limit LF? You can't tell and I ain't gonna try and find out!
