" Take as much time as you want to think it through, and let me know when you want to start." I think part of the point is that there is no guidance since they

" Take as much time as you want to think it through, and let me know when you want to start." I think part of the point is that there is no guidance since they're looking for someone who is passionate enough about something to be able to explain it. It sounds like you'll have time to gather your thoughts and it is even seen as a negative if you don't. I'm sure you can come up with something to explain after 5 minutes.