line 86 in search.php
[code=php]
            $value = (isset($_GET['value'])) ? intval($_GET['value']) : 86400;
[/code]
to
[code=php]
            $value = (isset($_GET['value'])) ? intval($_GET['value']) : 186400;
[/code]

or even a higher value

The best solution:
add the option to admin panel > features > change active topics
or
just show last 10 pages, i.e. include pagination for active topics...