I think the recommendation is at least 6 months and 3000 miles. I will be taking it in a few weeks so I can let you know my impressions of it. From what I have read it is really a compressed BRC (without the class time) where they reinforce what you learned on the BRC. Now that you’ve had time to get comfortable with the basics and start developing bad habits, hopefully they will catch that put you back on the right path. At least, that’s my impression from reading about it. If nothing else you get to spend some 1-on-1 time with an instructor so it can’t be bad.