This is a Premier Route. To claim an FKT on this route, you must meet a high standard of documentation and verification. See details here: https://fastestknowntime.com/premier-routes.

"Steeped in history, this National Trail chases along the mountain tops along the rugged backbone of England and offers 268 miles of the finest upland walking in England. A once in a lifetime experience."

Mt Rosa (11,499') is part of the Pikes Peak massif.  The standard Frosty Park route starts where the Gold Camp Rd turns to 4WD, at about 9800' (about 12.5 miles from Colorado Springs), and is about 6.5 miles each way.