Darkad five several hours. The immediate service which utilizes the expressway operates at the time every 20~thirty minutes and can take one hour. To be able to buy a ticket to the immediate service, you need to mention "Jik-tong" (직통), that's Korean for direct since the area bus is dearer http://andersonawrlf.dbblog.net/21371884/the-definitive-guide-to-ilsan-anma-service