Make SupportFlow check for new messages every 30 seconds

supportflow-faster-cron.php

/*
 * Setup fast cron schedule for SupportFlow trial
 */
function sf_cron_schedules( $schedules ) {
	$schedules['30-seconds'] = array(
		'interval' => 30,
		'display'  => 'Once every 30 seconds',
	);

	return $schedules;
}
add_filter( 'cron_schedules', 'sf_cron_schedules' );

/*
 * Run SupportFlow retrieve cron jobs more frequently to make trial easier.
 */
function sf_fast_cron_jobs() {
	if ( ! wp_next_scheduled( 'sf_30_seconds' ) )
		wp_schedule_event( time(), '30-seconds', 'sf_30_seconds' );

	if ( function_exists( 'SupportFlow' ) ) {
		/** @var SupportFlow $supportflow */
		$supportflow = SupportFlow();
		add_action( 'sf_30_seconds', array( $supportflow->extend->email_replies, 'retrieve_email_replies' ) );
	}
}
add_action( 'init', 'sf_fast_cron_jobs' );