Detect mouse movement

Hmmm, I cannot come up with a code to do what i want here. I'm not a begginer but i just can't figure this one out, can anyone help with the idea ? I want to detect how fast the mouse is moving and then transfer the speed to a value from 0 to 1, and then the animation of turning around will be played with the speed we got. So basically i'm trying to make the character realistically turn around when i rotate him with the mouse. What's silly is that i've came up with a code for this before and i lost it. Thanks in advance.

 

I think "Mouse X" or "Mouse Y" may be the input you're looking for

http://docs.unity3d.com/ScriptReference/Input.GetAxis.html

 

Yeah i don't know how i forgot about that axis, i'm stupid... Thanks.