How long would it take for the SR-71 Blackbird to circle the earth?

The SR-71 Blackbird has a top speed of approximately 2,200 miles per hour (3,540 kilometers per hour). The circumference of the Earth is about 24,901 miles (40,075 kilometers). At maximum speed, it would take around 11.3 hours for the SR-71 to circle the Earth, assuming it could fly continuously without refueling or any other limitations.