Rotate to Y degrees over X amount of time in .cs

Its in the question, Im new jsut started today if any one can help

Here is a solution to your updated question:

using UnityEngine;
using System.Collections;

public class Bug20 : MonoBehaviour {
	Quaternion  qTo;
	float speed = 90.0f;
	void Start() {
	  qTo = transform.rotation;
	void Update () {
	    if (Input.GetKeyDown(KeyCode.A))
	       qTo = Quaternion.LookRotation(Vector3.left);
	    else if (Input.GetKeyDown(KeyCode.D))
	       qTo = Quaternion.LookRotation(Vector3.right);
	    else if (Input.GetKeyDown(KeyCode.W))
	       qTo = Quaternion.LookRotation(Vector3.forward);   
	    else if (Input.GetKeyDown(KeyCode.S))
	       qTo = Quaternion.LookRotation(Vector3.back);  
	    transform.rotation = Quaternion.RotateTowards(transform.rotation, qTo, Time.deltaTime * speed);

‘speed’ is degrees per second. If you want a more eased movement, replace ‘RotateTowards’ with ‘Slerp’ and reduce the speed variable (perhaps to around 5).

this.transform.Rotate(0,20,0);//rotate 20 units every second, put this line in the FixedUpdate(){}

“this” refers to a script that is attached to some gameObject (Or has to be attached at least).

We want to access the Transform component from the current Script component, so we use a default variable “transform”.

transform allows us to use different functions to alter itself, Rotate() is one of them.