Hi Simon.
It is for 30 minutes for a textbook chapter with 30 pages. And remember with a textbook you will be doing numerous, multiple passes since it is a textbook and it will naturally take longer than just a regular book.
No superreading and skittering is nothing like photoreading. With superreading and skittering you are using the conscious mind. With photoreading you are exposing the book to the other than conscious mind. You should be reading something with superreading. You read when you dip to see if a particular sentence or word has something to do with your purpose.When you are superreading you are not reading you are scanning. You do read when you dip. You definitely are reading when skittering.You read the first and last sentence of the paragraph and you bounce all over the paragraph.
Photoread4me