Random Display Order Update Frequency

I’m trying to make the random order update faster than every 24hrs. I’ve found the documentation here:https://wpgeodirectory.com/docs-v2/places/sorting/

But where should I put the code? in my functions.php? or someplace else?

Also, what value am I changing in the code below to get it to update every hour?

Code:
add_filter(‘geodir_rand_seed’,’_my_geodir_rand_seed’);
function _my_geodir_rand_seed($rand_seed){
$rand_seed = get_transient( ‘geodir_rand_seed_custom’ );

// if we don’t have a transient then set a new one
if(!$rand_seed){
$rand_seed = time();
set_transient( ‘geodir_rand_seed_custom’, $rand_seed, 4 * HOUR_IN_SECONDS );
}

// validate
$rand_seed = absint($rand_seed);

return $rand_seed;
}