How long have you planned for your trip to the US to complete the course?
Don't forget to factor in some "differences training" when you get back to the UK. You WILL find it totally different to what you learn in the US
The course is 21 days, but I have booked for 28 days to allow some slack.
I have started some lessons in the UK, and hope to complete about 5 hours before I leave. I plan to have about 5 hours 'conversion' at least when I get back. As I said in a previous post, when all this is factored in, I don't expect it be any cheaper in the States than the UK.