Speeding up Rotation

Using the below code:

function Update() {
transform.Rotate(Vector3.left * Time.deltaTime);
}

What would I add to make the object this scropt is attached to rotate faster?

var rotationSpeed : float = 50;

function Update() {
transform.Rotate(Vector3.left (rotationSpeed * Time.deltaTime));
}

I didn’t get it, simply multiplying it with something maybe like:

transform.Rotate(Vector3.left *
Time.deltaTime *2 );

Maybe I got your question wrong.