Do they stop taking people at 6pm or do you need to be done at 6pm? Also, how long does it take from beginning to end?

I went in January during a slow time so it took a little bit more than an hour nobody was there after us so they might have gave us extra time. Plus since it was cold all the animals were out and active. When it's hotter the animals are sleeping and hiding in the shade. So I would say go first thing in the morning or late at night if you're going during the summer.

Depends on if you're Trolley or Walking. We did Trolley and it was about 45 minutes. I think they have the other question answered on their websites FAQ section.