How long did it take for the Challenger to hit earth?

Answer 1

The Challenger space shuttle was destroyed when its external fuel tank exploded less than a minute
after launch. Both objects were torn into fragments of varying sizes, and rained into the ocean off the
Florida coast of the Kennedy Space Center. There was little in the way of ballistic trajectory involved ...
nothing left the earth's atmosphere, and nothing achieved earth orbit. Nothing reached altitudes beyond
those of ordinary commercial airliners. All debris was in the water in a few minutes.

Answer 2

The Space Shuttle Challenger disintegrated 73 seconds after liftoff on January 28, 1986, due to the failure of an O-ring seal in its solid rocket booster. The debris fell back to Earth shortly after the explosion.

Answer 3

Challenger was a US Space Shuttle- it's missions took place in low earth orbit, in which it made one rotation about every 90 minutes, 1.5 hours, depending on its altitude.