Hello and Welcome!
Congrats on joining SP. It sounds like you are seeing some results and that's always a great motivator.
I imagine it's hard to fit in exercise with the long days you have as well as taking care of family.
A little exercise is better than none. Have you tried using any of Coach Nicole's video workouts? Some of them are pretty short. They are under the Healthy Lifestyle tab, then click video on the pull down menu.
Here is the link; www.sparkpeople.com/resource/videos.asp
Hope this helps. Best of luck to you!