The amount of time it takes for a husband to miss his wife can vary greatly depending on the circumstances, the nature of their relationship, and the individual personalities involved.
In many cases, if a husband and wife have a strong emotional bond and are used to spending a lot of time together, they might start missing each other shortly after being apart. This could be a matter of hours, days, or even minutes. On the other hand, some individuals may not experience feelings of missing their spouse as strongly, or they might have coping mechanisms that make separation more manageable.
It's important to recognize that human emotions are complex and can be influenced by a wide range of factors. If you're asking this question from a personal perspective or are concerned about someone you know, it's best to communicate openly with the person involved and be understanding of their feelings and needs.