If you want your web page to refresh itself or redirect to someother page after a given time below is the way to do that without going into the pain of writing java script or anyother script
Below code will refresh/call the given page after 1200 seconds = 20 Mins.
- Replace "URlToYourPage" to any page you want
- The time is given as seconds as a first parameter in content attribute you can change it to whatever time you want
<meta http-equiv="refresh" content="1200;url=URlToYourPage">