There are many reasons that men focus on work. Is this new behavior or has he always done this in your relationship? If this is something he has always done, then chances are it is not about you. It is about him and his commitment to his job. He feels that he needs to spend large amounts of time there, in order to get everything done. He probably feels that your marriage is secure and he doesn't need to worry. If this is something he has always done, getting him to change will be a long, slow process. Maybe encourage him to try and come home early on Friday's, and plan a date for just the two of you. Try to give him an incentive to come home at a reasonable hour. But, if this is a long-term issue, it will be slow and difficult for you to change.
If this is new behavior, then examine why he is staying away from home. Did something between the two of you change? What is causing him to want to avoid spending time with you? Look for the underlying reason behind this change.