NOTE: Stamp is derived from a mysql row subtracted from time() [i.e. time() - $row[ 'posted' ];]

   function convert_time( $stamp ) {
      $weeks = floor( $stamp / 60 / 60 / 24 / 7 );
      $weeks = ( $weeks < 1 ) ? "" : $weeks . " weeks ";

      $days = floor( $stamp / 60 / 60 / 24 );
      while ( $days >= 7 ) { $days = $days - 24; }
      $days = ( $days < 1 ) ? "" : $days . " days ";

      $hours = floor( $stamp / 60 / 60 );
      while ( $hours >= 24 ) { $hours = $hours - 24; }
      $hours = ( $hours < 1 ) ? "" : $hours . " hours ";

      $minutes = floor( $stamp / 60 );
      while ( $minutes >= 60 ) { $minutes = $minutes - 60; }
      $minutes = ( $minutes < 1 ) ? "" : $minutes . " minutes ";

      $age = $weeks . $days . $hours . $minutes;
      return $age;
   }