i need to limit numbers of comments user can post per time

as example: user can post only one comment / 24Hours

i try following function code

"function dam_the_flood( $dam_it, $time_last, $time_new ) {
if ( ($time_new - $time_last) < 86001 ) // time interval is 86001
return true; // seconds
return false;
}
add_filter('comment_flood_filter', 'dam_the_flood', 10, 3);"

it works with other website not use wp-discuz

but not with wp-discus

i hope can fix that issue

thanks