Windows Service speed problem

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C#

I have a problem regarding two timers in Windows Service
The second TimerLimit is never executed.
I have set up first timer to parse email and i need it to do constantly while the second timer is because i need to be executed after 20 seconds if something happen after having reading emails.
I am a beginner but it seems like there is a conflict.
Is it possible because the first timer is too fast ?
any suggestion to solve this problem ?
Thank you in advance

public partial class GSAService : ServiceBase
    {
        Timer timer;
        Timer timerLimit;
        bool stop = false;
        public GSAService()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            stop = false;
            ParseEmail.DeleteFiles();
            timer = new Timer(200);
            timer.Elapsed += new ElapsedEventHandler(ExecuteService);
            timer.Enabled = true;
            timerLimit = new Timer(20000);
            timerLimit.Elapsed += new ElapsedEventHandler(ExecuteServiceLimit);
            timerLimit.Enabled = true;
        }

        protected override void OnStop()
        {
            stop = true;
        }

        private void ExecuteService(object source, ElapsedEventArgs e)
        {
            if (stop)
            {
                return;
            }
            try
            {
                if (ParseEmail.isNotUse)
                {
                    ParseEmail.isNotUse = false;
                    ParseEmail.ParseValues();
                }
            }
            catch (Exception exp)
            {
                ParseEmail.isNotUse = true;
                Console.WriteLine("Exception: {0}", exp.ToString());
            }
        }
        private void ExecuteServiceLimit(object source, ElapsedEventArgs e)
        {
            if (stop)
            {
                return;
            }
            try
            {
                    ParseEmail.CheckLimitOrders();
            }
            catch (Exception exp)
            {
                Console.WriteLine("Exception: {0}", exp.ToString());
            }
        }
    }
}