Is it normal for a 9 year old to take three weeks to read a book?

My 9 year old son Cecil has spent three weeks reading Tolstoy's 'Anna Karenina', and he's only on page 489. I regard this novel as Tolstoy's finest work and young Cecil cannot even clearly explain its central themes. His essay on the first quarter of the book did not show clear insight into the... show more My 9 year old son Cecil has spent three weeks reading Tolstoy's 'Anna Karenina', and he's only on page 489. I regard this novel as Tolstoy's finest work and young Cecil cannot even clearly explain its central themes. His essay on the first quarter of the book did not show clear insight into the thematic arc at all.
Is the boy of lower than average intelligence?
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