Goodwill Assistant Store Manager interview questions

It started with a short phone interview. Met with Store manager only for 2nd interview and it was pretty easy. Next meeting was Store Manager & District Manager, the questions got a little bit more difficult. Then I received a call for 3rd interview and I was told that I would be meeting 8 people for finale interview. This was the core of top bosses from the main office. I was stressed walking in and seeing so many people all waiting to interview me. Definitely was overwhelming at first, however; everyone was really nice and they somehow made it comfortable for me. There were lots of questions about my experience, how I felt about goodwill, why I wanted to work there and stuff like, what was my most challenging customer, how did I resolve it. What was my most successful project I had come up with and then implemented it ? I think it lasted about 45 minutes, and I did have to answer a couple questions from everyone present and I was super relieved when it was over!!