file1.php

 $this->_args = wp_parse_args( $args, array(
            'form_id' => false,
            'limit' => 1,
            'limit_by' => 'ip', // 'ip', 'user_id', 'role', 'embed_url', 'field_value'
            'time_period' => 60 * 60 * 24, // integer in seconds or 'day', 'month', 'year' to limit to current day, month, or year respectively
            'limit_message' => __( 'Sorry, you have reached the submission limit for this form.' ),
	        'apply_limit_per_form' => false,
	        'enable_notifications' => false
        ) );