The 5-minute and 15-minute breaks are discussed on the forum. It's for longer period of studying. Work 20-minute, break 5, Work 20-minute, break 5, Work 20 minutes break at least 15. Repeat 2 more 20-minute periods with a 5-minute break. At this point you'll have worked about 2 hours ... give it a real rest like 30-minute meal break longer is better.
The 20-minute incubation time after PhotoReading is the minimum amount of time recommended for a book ideally leave it overnight.
Alex
