The Blitz OU is an abridged version of the OU and is mainly aimed at those who have not been to the OU. If you have been to the OU and still have questions afterwards, you can come and we will answer your questions.
That doesn't matter, just send us an email to Info Point. Either we will clarify your question by e-mail or we will arrange an extra meeting with you.
That depends on how many questions you and your fellow students have. However, you should plan on two to three hours.