The phrase "gearshift times" refers to the amount of time it takes to change gears in a vehicle. It is commonly used to discuss or measure the speed and efficiency of shifting gears while driving. Full definition
It enhances engine performance with reduced gearshift times. (abarthpress.com)
Aluminium gearshift paddles on the steering wheel exclusive to BMW M allow a manual gearshift significantly shortening gearshift times by the new technology reducing torque in the transmission through the deactivation of individual cylinders. (ausmotive.com)
Gearshift times on the F1 «box drop to 60 milliseconds. (evo.co.uk)