Only about 190 miles. Orbital period is 91 min. It's easy and fun to look for around sunset using the ephemeris at, e.g., http://www.heavens-above.com/ http:

Only about 190 miles. Orbital period is 91 min. It's easy and fun to look for around sunset using the ephemeris at, e.g., http://www.heavens-above.com/ http://www.heavens-above.com/ If it goes straight overhead, it takes only a couple of minutes horizon-to-horizon.