It's difficult to say how many words Murakami writes in a day, as this can vary depending on his writing schedule and the demands of his current project. In interviews, Murakami has said that he writes for several hours each day, usually starting in the afternoon and continuing into the evening. He has also said that he doesn't like to push himself too hard when it comes to his writing and that he tries to maintain a healthy balance between his work and his personal life. It's likely that Murakami's daily word count can vary depending on these factors and others, so it's impossible to give a specific number.