Hi, I can at least partly relate to your question.
I have a 50-60 hrs non-trombone working week, one wife and two kids...
I play trombone only for fun, but have been a professional bass trombonist many years back.
First of all:
If you really get more or less daily practice time of 45min to 1h a day, it should not be a problem to do more than that in rehearsals or when you have more time at the weekend.
In rehearsals you don't continuously play and typically should not play at your limits the whole time.
What you should not do is a 5 hours practice session at the weekend without a break.
Most important is to develop a very targeted practice program. Maybe you have a teacher who can help you with this.
You should not spend too much time on a pure warm-up, but really try to have as much value in the time you have available. This practice program wil continuously develop and adapt to your abilities. Don't worry, it should also allow some fun of course.
One thing that I find very helpful is to have a "scalable" practice program. What I mean: It can help to start with what is most important and essential to you and know what you add if you have more time.
I am quite sure that you can fit the essentials in a 45 minute session and that this will also allow progress.
What I do:
I currently start with some buzzing, ideally on all my mouthpieces that I kind of regularly use.
Then I do 20-30 minutes basics sessions.
If I have the time, I will do these on two or three different trombones. So this is a bit specific.
I hardly ever fit in any concert pieces, parts or excerpts, again this is specific.
I normally spread these sessions over the day and fit them in whenever I can, working from home a lot.
One little idea: Get a good practice mute so that you are less dependent on daytimes
