Today (Sunday September 20) at 10:00 the queue was back to the Otemon Gate and the wait time was 2.5 hours. Fortunately, I didn't want to go in - I've been inside on a previous trip and just wanted some perfect, blue sky photos. And on my 3rd visit to Himeji, I've finally done it. :)
For those who want to go in, and can't avoid Silver Week, maybe start queuing early?