This always seemed crazy to me, but seeing what you guys have said here was encouraging. I tried this for the first time Wednesday night.
I usually don't get home until 7 or so. But I've got 3.5 year old twins at home and my wife has to work late maybe 4-6 times a month. I leave early those days to get the kids and usually get home around 5. I figured I'd give it a try on one of those days.
My criteria for success included not only getting to bed at a reasonable hour but also not completely neglecting the children. Also, I did not want to neglect other routine nightly chores, like picking up mess or doing the dishes. I also kept my plan a secret to see if I could do it without SWMBO even knowing. Not nefariously, just because that would mean it was really unobtrusive.
I weighed, measured, and organized the night before. I did not crush my grain, because there was a decent chance I would have to abort for one reason or another. Next time, I would crush in advance, too.
5:08 - Fired up HLT; Sent kids outside to play; Milled grain; set up chiller; played with kids.
5:38 - Mash in and messed around with ice to hit the right temp; Fed and bathed children.
7ish - Let kids watch a TV show; Start sparging; wash dishes and tidy up house while MLT drains;
--super slow sparge. I use a corona mill and though I usually condition my malt, I didn't this time. Cereal Killer arrives today!
8 - heat BK
815pm - throw in 60 min addition; read to kids; put kids to bed; transfer previous beer from fermenter to keg; tidied up more.
915 pm - start cooling.
9:30 - Pitch; start clean up; wife comes home around this time.
10:08 - head to bed
earlier than usual.
Even though my wife was home before I was done cleaning, she just thought I was putzing around with various beer related things, as I tend to do after the kids go to bed. In the morning I told her I brewed a beer and she was very surprised.
Getting everything sorted out the night before makes all the difference. It left me without any real tasks to accomplish during the mash or boil, which left me plenty of time to give attention to the kids. Had I crushed my grains in advance, it would have been even better. The only negative was that I plopped the kids in front of the TV a bit longer than I would have liked. But again, a quicker sparge would have fixed that. If they misbehaved things could have gone haywire, but I staved that off by setting up an ice cream reward for good behavior right away. It also occurred to me that if I ran out of propane I would have been SOL. I wasn't going to take the kids on a 7pm propane run.
It really couldn't have worked out better. I might start doing this regularly to free up my weekends. That's particularly important now that golf season is coming around.