Restart Timer After Few Hours

Hi, I have been using the Countdown timer on a website. There looks like no option to restart the timer automatically. I even bought an extension because on the plugin settings there is an option to restart the time. So, I tested it and tried to reset it every 4 hours but that doesn’t work at all.

I am using it on the top bar with the help of shortcode. Please let me know is there a way to restart the countdown automatically.

Best regards,
Ashish