trying to turn in random direction : error CS0019: Operator `*' cannot be applied to operands of type `UnityEngine.Quaternion' and `float'

Hi guys, trying to make my spaceship turn slowly to direction rather then just "Jumping" to a new random direction, is their a way to sleep this? i have a timer that counts down and overtime it hits 0 it chooses another random direction to make the ship fly around "randomly"

Hi guysuim trying to turn my AI ship:

 public Quaternion direction;
      private float turnspeed = 12;
 private float DirectionCooldown = 25f;
 
     //---------------------------------------------------------------------------------------------------------------
 
     void Start (){
   
     direction = transform.rotation = Random.rotation;
     }
 
 
  // patrolling behavior
         if (Patroling = true) {
             if (PhotonNetwork.isMasterClient) {
 
                 this.transform.rotation = direction * turnspeed * Time.deltaTime;
                 // Invoke a loop:
                 DirectionCooldown -= 1 * Time.deltaTime;
                 if (DirectionCooldown < 1) {
 
                     //change directrion
                     direction = transform.rotation = Random.rotation;
                     DirectionCooldown = 25;
                 }
             }
         }