mmorpg2d/Assets/autoDisableGameObj.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class autoDisableGameObj : MonoBehaviour
{
    public float disableTime = 5f;

    /// <summary>
    /// This function is called when the object becomes enabled and active.
    /// </summary>
    void OnEnable()
    {
        StartCoroutine(DisableIteself());
    }
    private IEnumerator DisableIteself()
    {
        yield return new WaitForSeconds(disableTime);
        gameObject.SetActive(false);
    }
}