how could you, while holding a button destroy then reinstantiate an object in original position after time?

ok basically im using the line renderer. im trying to move it(and activate it) when i press a button so that it looks like a shot(this works). What i am asking is what do u need to, while holding a button i want to remove it and make it spawn back to its original starting position, after a period of time so it mimics shooting bullet paths like a machinegun.

here is code:

public class TurretLight : MonoBehaviour {
public LineRenderer line;
public float bulletspeed = 5.0f;
public float lifetime = 1.0f;

// Use this for initialization
void Start () {

    line.renderer.enabled = false;


// Update is called once per frame
void Update () {

    if (Input.GetKey("f"))
        line.renderer.enabled = true;

        if(line.renderer.enabled == false)
        Instantiate(line, transform.position, transform.rotation);

        transform.Translate(bulletspeed * Vector3.forward * Time.deltaTime);
        LineRenderer.Destroy(line, lifetime);

    else if (Input.GetKeyUp("f"))
        line.renderer.enabled = false;


thanks please just reply if u no the code and how to do this ive tried everyting so far and would appreciate the help. sorry if a question like this has been answered already.

First you should add these variables:

float time;
bool hasStarted = false;
bool hasEnded = false;
int timeDelay = 3; // Or however long you want your intervals

Then after that, deactivate the object and start the clock

void FixedUpdate() {
     if (!hasStarted && !hasEnded) {
 = false;
          time = Time.time;
          hasStarted = true;

     else if (hasStarted && Time.time >= time + timeDelay && !hasEnded) {
 = true;
          hasEnded = true;

     else if (hasEnded && Time.time > time + timeDelay) {
          hasStarted = false;
          hasEnded = false;

This is untested and written in C#