ROTD excerpt length

Hello,

I would need the ROTD widget to display more than a single row. I would need 700 characters to be displayed. Can you help with some guidance? I’ve started with the below from a solution i got from you guys on a different aspect of the site. Not really sure if the ‘geodir_rotd_excerpt_length’ exists. Once function is ok I will paste this in the functions file.

// Change ROTD review excerpt length
function custom_rotd_excerpt_length() {
return 700;
}
add_filter(‘geodir_rotd_excerpt_length’, ‘custom_rotd_excerpt_length’);

Thanks!
Kira