1Q84, Haruki Murakami's new novel, is 1,000 pages long and is published in three volumes. It took the author three years to write and it is possible, on an 11-hour flight from New York to Honolulu, to get through about half of it. Murakami looks crestfallen on receipt of this news – the ratio of writing to reading time is never very encouraging for a writer – and yet if anything tests a novel's po