PhotonTimer

using Photon.Pun;
using Photon.Realtime;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Hashtable = ExitGames.Client.Photon.Hashtable;

public class PhotonTimer : MonoBehaviour
{
    #region SINGLETON
    public static PhotonTimer Singleton
    {
        get
        {
            return GameObject.FindObjectOfType<PhotonTimer>();
        }
    }
    #endregion

    public bool startTimer = false;

    [Space(10)]
    public double milliseconds;
    public int seconds;
    public int minutes;

    [Space(10)]
    double startTime;
    double timerIncrementValue;
    [SerializeField] double timer = 20;
    ExitGames.Client.Photon.Hashtable CustomeValue;

    void OnEnable()
    {
        if (!PhotonNetwork.IsConnected)
            return;

        if (PhotonNetwork.IsMasterClient)
        {
            CustomeValue = new ExitGames.Client.Photon.Hashtable();
            startTime = PhotonNetwork.Time;
            startTimer = true;
            CustomeValue.Add("StartTime", startTime);
            PhotonNetwork.CurrentRoom.SetCustomProperties(CustomeValue);
        }
        else
        {
            startTime = double.Parse(PhotonNetwork.CurrentRoom.CustomProperties["StartTime"].ToString());
            startTimer = true;
        }
    }

    void Update()
    {
        if (!startTimer)
            return;

        if (PhotonNetwork.IsConnected)
        {
            timerIncrementValue = PhotonNetwork.Time - startTime;

            milliseconds  = timerIncrementValue % 1;
            seconds = (int)timerIncrementValue % 60;
            minutes = (int)timerIncrementValue / 60;


            if (timerIncrementValue >= timer)
            {
                //Timer Completed
                //Do What Ever You What to Do Here
            }
        }
    }
}