Length

There are many books in our library, some of them are very short and some are very long. So all books were divided to six categories:

words time
Shortest 1000 10 min
Shorter 3000 20 min
Short 6000 40 min
Medium 10000 1 hour
Long 17000 2 hours
Longer 25000 3 hours
Longest 35000 4 hours

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