I know your pain. I, too, have little ones, a job, and house/yard to take care of. Haha. Life!
Anyway, I've mashed overnight a couple times. Would probably save you at least an hour and a half on the other side. My not-so-scientific advice would be to start the mash a few degrees high because it's going to drop overnight more than you would ideally want. Not sure what your setup is, but if you mash in a cooler and wrap that in a few blankets, you can pull it off. Worked for me anyway.