To set content playtime interval for your content: 1. Click on the playlist you want to set the content playtime interval to. 2. On the right top corner you will see a "Settings" icon. Click on it. 3. At "Interval (sec)", choose the number of seconds you wish each piece of content from that playlist to be displayed on the wall. You can do so by pressing the up and down arrows. 4. When you finish, click "Apply" to save your changes.