Hi Shiro-san! Thank you for your inquiry. If you're not in a hurry, it will take approximately 5hrs to view depending on the crowd level & also including approx. 20 mins walk from JR Himeji Station to the castle. It is a 6-story structure including the basement and it's huge with an impressive sight to explore the gardens other exciting views inside. The castle has a lot more to offer. I hope you enjoy your visit!