You know sometimes we all just need some time away. I think this is a good thing in a relationship. It reminds you of the longing you had for each other when you relationship was new. You remember the days hoping the other person would call you for a date. Well when we are apart we need to remember those feeling. Today it is even easier to stay in touch with cell phones and email. So when your a couple you really are never disconnected.
Going to work helps with the separation from time to time. It's nice to come home to your partner when you haven't seen them all day. You usually have things to talk about or concerns that arose during your day. It's a chance for you two to get reconnected on a daily basis. My parents worked together for 20 plus years and when they were off they had nothing to talk about. So I think it is important for a relationship to have time apart.
Now I don't think long absences are necessarily good for a relationship when they are frequent. I do, however, think they are good every once in a while. They bring back those feelings that you really miss your partner. When you know they will be home at five you don't really get the same feeling. Make note of how you feel when your partner returns home from an extended period of time. I bet your heart is racing and you just can't wait to get them in your arms.
Here is an exercise to try. Spend the day apart, totally. No calls, no emails, go for a day away with your friends or just by yourself. Then make dinner plans for the two of you that evening. I want you to not even see each other until dinner time. It will be like a date you had when you were dating. You just might remember how special that person setting across the table from you is. That is if you have forgotten.