I was thinking that you could at least take the first day and you could take days 2 and 3 next month if you can't take off 3 days on such short notice.
Our Revit instructor, Mark Rothman is ranked as one of the top 5 Revit instructors in the US, and we have a very high success rate because of how we teach the class.
You can sign up at this link for future classes or sign up and pay for tomorrow. The class is $295 and includes the Autodesk Revit Essentials manual. Contact me before 9am tomorrow if you have questions or want more information.
There are more details about the class here www.revit3d.com/class
You can pay as you go and just pay for day one for $100 if you're not 100% committed.