It is self-paced and there's no time limit on your access to the course lectures.
No. This is a great course for both beginners and advanced students. It can be the perfect introduction to political philosophy, but also something you study repeatedly throughout your lifetime.
It is recordings of a live seminar, which discussed each book of Plato's Republic in a separate session. 10 books, 10 sessions. The course is taught from a Straussian perspective, meaning that it uses Leo Strauss and his students (e.g. Allan Bloom) as guides.