In article . net,
"Steven P. McNicoll" wrote:

The X-15 had turnaround times less than two weeks.

It did, after some lower and slower flights.

Not after the high-altitude flights, though, and the average gap between
"hard" flights of the same airframes was a month and a half.

They also had a tendency to need major parts of the airframe (tail and
wing surfaces) replaced or refurbished after the more demanding flights.

Not to mention they were doing this with a much smaller payload.

--
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Remember: Objects in rearview mirror may be hallucinations.
Slam on brakes accordingly.