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To use afterburners in Microsoft Flight Simulator X, apply full throttle.
B52 B1B B17 B24
The obvious answer is, until it runs out of fuel. If immediately after takeoff the pilot used his/her afterburners they would have about 7 minutes max.
Are you talking about the B-1 Lancer? Those are airship bombers
about 1.7 mach without afterburners with afterburners 1,317 mph over 2 mach (1 mach speed of sound about 680 mph
I believe about 65 are still operational, with some 20 'mothballed'.
There are currently 60-63 B-1 Lancers active in the USAF.
It's specified Max. Speed is mach 2.25 (1,500 mph, 2,410 km/h). It is the first fighter aircraft to achieve supersonic speeds without afterburners. (Mach 1+ without afterburners).
Overdrive afterburners, and supersonic flight capability- It is, alas, obsolete.
It hits max. 1.7 in super cruise and max. 2.0+ with afterburners.