The thing to remember is you do it in layers. You will usually spend more time with a book than an article.
You activate the book in 20-30 minute sessions 'looking' for answers to the questions you formed from your trigger words. So you start with a question in mind, open the book to where you are drawn to look for an answer... one chapter may have caught your eye from the index, or you just open the book where it feels right. You spend 20 to 30 minutes looking for answers.
After the first 20-30 minutes it is important for you to write down your answers (especially as a beginner). A Mind Map is recommended for this because you can build on it with your next 20-30 minute activation session. It also helps you to see the book gelling for you.
You do this about 4 to 6 times for your first few books to get them to 'gel' for you. So your total time spent with the book is 2 to 3 hours instead of 6 - 9 hours that it takes the average reader to regular read a 150 to 200 book. You'll notice that some books will take less time and others more. This is because of the difference in writing style, your connections/experience with the subject, how much you want to know from the book etc.
So remember to see superreading and dipping as something you do as often as necessary to get the book to 'gel' for you rather than just a once over. The amount of time you spend with a book using the photoreading system is considerably less than with regular reading.
Alex