smarty/docs/en/programmers/api-variables/variable-cache-lifetime.xml

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   <sect1 id="variable.cache.lifetime">
    <title>$cache_lifetime</title>
    <para>
     This is the length of time in seconds that a template cache is valid.
     Once this time has expired, the cache will be regenerated. $caching must
     be set to "true" for $cache_lifetime to have any purpose. A value of -1
     will force the cache to never expire. A value of 0 will cause the cache
     to always regenerate (good for testing only, to disable caching a more
     efficient method is to set <link
     linkend="variable.caching">$caching</link> = false.)
    </para>
    <para>
     If <link linkend="variable.force.compile">$force_compile</link> is
     enabled, the cache files will be regenerated every time, effectively
     disabling caching. You can clear all the cache files with the <link
     linkend="api.clear.all.cache">clear_all_cache()</link> function, or
     individual cache files (or groups) with the <link
     linkend="api.clear.cache">clear_cache()</link> function.
    </para>
    <note>
     <title>Technical Note</title>
     <para>
      If you want to give certain templates their own cache lifetime, you could
      do this by setting <link linkend="variable.caching">$caching</link> = 2,
      then set $cache_lifetime to a unique value just before calling display()
      or fetch().
     </para>
    </note>
   </sect1>

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