I have done 2 days already - Wednesday will be the final day.
It's a very mixed group - day one we had to tell of the circumstances of our conviction, what we blew and what our ban was. Lots of wide ranging stories, but I must say it was nice to be open and honest about it and I only told my parents. Day 1 was 4.5 hrs.
Day 2 was a whole day. Went over stuff from day 1 and did more calculations of units. We wore 'beer' goggles, which were supposed to be about 47 reading. Though we all agreed that it was much more than that. It is a good class, can be therapeutic too.
Just remember to take photo i.d with you and a calculator if you don't have one on your phone. For all 3 days!
Also, try to make some friends and engage in the course - it can help time go faster.
Be early! Anyone late is not admitted - which happened on day 1. On day 2, someone did not turn up so could not complete the course. Shame, as he had paid for it so won't get his money back.
Next week I think will be the 'hard' hitting stuff of what could have potentially happened. I am glad to have done it, though I am looking forward to finishing it