While google maps puts the streetside sidewalk between buildings at a bit over 1/2 miles but by the time you add the top T7 concourse / first gate to the actual TBIT lounge location inside the TBIT terminal it is closer to 3/4 mile streetside one way. And if you google map trace the circuitous airside walk it is just under 6,000 feet or just over 1.1 miles. Roundtrip from a gate at the end of a T8/T7 concourse to TBIT and you are close to 3 miles.