I don't know if this will help or not but here goes.
I struggle with this a lot, and so does the second wife. She works lots of nights and odd hours in general, while dh is home weekends and evenings. I take care of the children as well as their education and most days, the housework :roll: Time is difficult, because I have had him to myself for 10 years. Now suddenly I have to share, and I don't like that much. Then my time is scheduled around her time for the most part, simply because there are nights when she is here, and nights when she isn't, and that changes every week. So this last week, dh was with me almost every night. And yet when she was home last night and they went to the store, I felt jealous to a degree because I don't get the opportunity to go "out" as often as they do.
I have to be very very careful to not get jealous over the small things like that, and not to keep track of how much time was spent where doing what, or I get very upset very quickly. I shouldn't, I know. Dh tries to sort things out in such a way that we get roughly an even amount of nights per week, but even then, he tends to favor her in certain situations because she hasn't had as much time with him.
From my perspective, I would say it would make sense to keep track privately, and try to keep things even within reason. But don't necessarily make it (or allow it to become) a big issue, because those feelings of jealousy can be very hard to work with.