I only spend about 3 to 7 minutes mind mapping and usually do it while activating the book. (put the pen down a lot)
PhotoReading again can be part of the activation. Call it an activation layer. So no need to wait again. Activation can be 3 to 40 minutes in a block. You set the time. Personally I like a minimum of 7 minutes and maximum of 20 when I take a break.
So for textbooks you may only need 7 minutes to activate the chapter. Once PhotoRead you don't need to PhotoRead again. You do however need to check your purpose a lot.
Prepare and ideal state are the most important step to do before previewing, before PhotoReading, before postviewing or before activation. In other words each time you take a break, You start with prepare.
Make sure you are asking the author questions. Then you know what you need to mind map and not more.
The 5 day test gives structure. The times are not exact some will need 2 minutes to finish mind mapping others couldn't finish mind mapping unless there's no room left on the paper.
That's not saying either is wrong. It's pointing out there is a personal preference that is based on desire and need to know and confidence.
Use the system and you'll recognise your desire, need to know and confidence will show up for you.
Alex