Look at spending approximately 1/3 to 1/2 the time you would use for regular reading on that type of book. In all probability you would go through that book from cover to cover 4 times if you want a good recall of the quotes.
What it feels like to have a book gel is probably unique experience for each person (same as eating an apple 
) On the whole though you 'know' you got it all, you satisfied you 'purpose'. This is why you need to be able to state your purpose when you start.
This is the best site I found that explains mind mapping. http://www.jcu.edu.au/studying/services/studyskills/mindmap/index.html
The thing to remember about mind mapping is that it is creative. It really is something that needs to be approached with the sense of play or game. Humour and corny makes your triggers on the mind map more memorable.
Alex
