Ff you know your muzzle velocity and distance you can compute time. The physics involved in a 1.5 mile shot is simple math. The physics involved in making that math apply in the real world is really complicated. Wind, elevation, humidity,and after all that your target has 3 seconds to just move. Amazing shot.
“Ff you know your muzzle velocity and distance you can compute time.”
Not that simple ....
Would a brick launched at the same speed take the same time?
No.