You do want to maintain the Tangerine throughout the PhotoReading whole mind system.
You do not have to keep your attention on it once you put the tangerine up there. But, when you notice that it is gone, gently bring it back up.
One cue is if you find yourself focusing on words on the page, even when dipping or rapid reading.
Of if your mind wanders too much.
Or if you feel out of balance.
