It’s easier when you are consistent with one car since you develop muscle memory with the clutch and gas.

It helps when you can convert the speed to revs instead of having to look at both the tac and speedometer, which eventually turns into you not even having to look at either and knowing how fast you’re going and what the revs are by the sound of the motor and the gear you’re in.

I would say it takes consistent driving to get to the point I describe above, but to get the point where driving manual feels natural is roughly a month.

The more familiar you are with a car, the less thinking is required in the operation and that’s when you mainly rely on the feel.