The SMIL Tutorial - Synchronization - The vim icon during 6 seconds...

Chapter 4. Synchronization - screen 2 of 9

The vim icon during 6 seconds...

Adding the duration ("dur") parameter and setting it to "6s" will make the vim icon be visible only 6 seconds.

<smil>
 <head>
  <layout>
   <root-layout width="300" height="200" 
        background-color="white" />
   <region id="vim_icon" left="75" top="50" 
        width="32" height="32" />
  </layout>
 </head>
 <body>
  <img src="vim32x32.gif" alt="The vim icon"
        region="vim_icon" dur="6s" />
 </body>
</smil>

Source - See it running in SOJA