Hi chrisbl,
I have heard stories of people waiting 4 hours. I suppose that it depends on your circumstances and the checks they need to do before they see you. I am male, grey, , 49 with a solid job here and I suppose at little risk of being a terrorist or illegal immigrant.
Let see, last time I checked, I'm a white male born in Cardiff, blonde hair, blue eyed 26 year old. Having finished University a few years ago I've had steady employment ever since.
Been with BT for the last 5 1/2 years and have current government security clearance for my job in the Internet Data Centre...
... I was still held at the Embassy for 4 hours on BOTH occasions (then a minute interview with a congratulations we'll issue you an M-1 visa at the end)! ;-)
Best wishes,
Charlie Zulu.