I find groups of 5 to 6. When I do 20 books I usually also do them in blocks of 5 to 6. This means I could do the time line thing with each set over about 4 days after that time I forget about it altogether. I don't put a lot of effort into the timeline thing when I have 20 books I just state my affirmations like for regular photoreading clearly and slightly longer closing affirmation.
With only 5 or 6 books I put the timeline thing into effect. Interesting results each time.
Alex
