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Probably for the same reason that people can look at a watch, and then immediately afterwards, not be able to tell you what time it is. They don't usually ask the watch "what time is it?" They ask it "am I late?" or "do I have time to finish this task first?".
When reading a book, I ask "how far along am I?" or "how near is the end?", which is better answered by a percentage, than by an actual page number.
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