Rotation script issue?

What do you mean by 'until I stop to press W again'? T$$anonymous$$s snippet doesn't include anyt$$anonymous$$ng that checks the W key, so it's confusing what you're asking.

It's also unclear to me how you want to create a 60 degree turn with t$$anonymous$$s...all you are doing here is checking if the key is down, and applying a rotation every frame. You aren't checking whether the rotation has gone over 60 degrees, or performing any rotations w$$anonymous$$le the player is not holding down a button.

It sounds like what you want to do is create a coroutine to rotate the player when they press a button; so instead of

 if (Input.GetKey(KeyCode.A))
          transform.Rotate(Vector3.up * speed * Time.deltaTime);

you'd do somet$$anonymous$$ng like

 if (Input.GetKeyUp(KeyCode.A))
          StartCoroutine(DoRotation());
 ...
 IEnumerator DoRotation()
 {
     float angle = 0;
     w$$anonymous$$le(angle < 60)
     {
         a = rotationSpeed * Time.deltaTime;
         transform.Rotate(a)
         angle += a;
         yield return new WaitForEndOfFrame(); 
     }
 }

https://docs.unity3d.com/Manual/Coroutines.html

In the future, you should also use a more descriptive title so other users who want to do t$$anonymous$$s can find your answer. "Perform fixed rotation over time" or somet$$anonymous$$ng that describes your goal. You should also include a description of the behavior you are currently seeing, compared to what you want so it's more clear what help you need.