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... the original Space Shuttle could stay in orbit for up to 17 days—a limitation largely due to the needs of the crew—the first X-37B mission, OTV-1, spent 225 days in space under the guidance of Air Force space flight controllers at Schriever Air Force Base, Colorado. The second mission, OTV-2, handily doubled that number, clocking 469 days in orbit. OTV-3 is currently at 482 days and counting.
Eventually—nobody knows when—the pudgy space plane will glide back down to Earth like the Space Shuttle it resembles, rolling to a stop on an Air Force runway in California.
Will The Pentagon's Secret Space Plane Ever Return to Earth? - The Daily Beast