I've been expediting by airplane for the last 12 years. I've run into several Husband/Wife teams at airports when I pick up and deliver loads. My wife and I have been married 30+ years. Not sure we could be together 24/7. How do you do it?
There are married people who get along great being together 24/7 and living in a truck. There are other married people who would come close to killing each other if they lived like that. That does not mean that either marriage is happier. It's just the way it happens to be with a particular married couple and their lifestyle of choice.
Diane and I enjoy each other's company, work well together, love life on the road and consider ourselves blessed to have a job (expediting) that enables us to do all three.
Two relationship practices we stumbled into and later named are (1) veto power and (2) me time.
Veto power is a rule we follow. If one of us wants to do something and the other does not, veto power can be exercised. When it is, the discussion is over and the thing will not be done. It is rarely needed or used but it helps to have it in the mix.
Me time is time apart from the other. It usually happens during a layover. One or both of us will say "I want some me time." On that signal we part company.
Typically, Diane will go to a bookstore and settle in for a few hours. I might do the same or go to a movie. Either of us might go for a long walk or sit in a park alone. We remain in contact by phone and walkie-talkie in case something important comes up. After a few hours we start missing each other and me time comes to an end.