You will be given 24 hours to complete the exam and it has both theoretical and practical elements. the practical part of the exam can take up to 3 hours to complete hence the generous time allotted. The pass mark is 85%, I believe 70% of the marks relate to the practical section of the test.
my advice to you would be to read the textbook in its entirety, practice with a mock exam before attempting the real exam.
I wish you all the best of luck.