the total time consumed in the round trip of a ship, aircraft, vehicle, etc.

turnabout.

change of allegiance, opinion, mood, policy, etc.

a place or area having sufficient room for a vehicle to turn around.

the time required between receiving and finishing or processing work or materials.

Commerce .

a reversal, as in business sales, esp. from loss to profit.

the time between the making of an investment and receiving a return.

Aviation . the elapsed time between an aircraft's arrival at an airfield terminal and its departure.

noun

inversion , transposition , turnabout