Could be a lot or could be two interviews. Be optimistic and let them know you are self motivated and willing to work a lot of hour. If you can make it to the GM interview I would say you have the position. I would advise walking the store first before you decide it is the environment you want to be in.
I applied in-person. The process took 4 weeks. I interviewed at Hendrick BMW (Charlotte, NC) in Apr 2013
Interview
Submitted an application with references, took a personality test and had a brief pre-interview with the new car manager. Was called back for a full interview with the new and pre-owned managers, and the GM, two weeks later.
I was asked specific questions about my previous employment, how I would handle certain situations, and how I thought my personality might fit the company.
Interview questions [1]
Question 1
No difficult questions, however, I was surprised at their expectations regarding the personality test. They are looking for very aggressive - pushy, really - people to fill the spot.