As others have said, mashing overnight and no-chill can allow you to stretch out things over three days, the actual "hands-on" time from starting to heat water for the mash through to pitching yeast can be pretty minimal, but there's a lot of hanging around.
Don't underestimate the extra time it takes to heat/cool 23+ litres though - and if you really want to push things along then you might want to consider 2 coppers, or 1 copper + an immersion heater to speed up the dead time spent heating. And a bigger chiller (and some ice water to help it along towards the end) will never hurt!!! But you probably don't need to go that far.
But given that the first hour or so has almost no hands-on time, I would suggest that either you set it up the night before and then set a timer to heat it up to mash temperature whilst you're still in bed. Or if WFH then you can flick the switch at 3pm or whenever so that it's ready to mash at 4pm (or if you're being purist about WFH, you could let the time switch turn it on at 3pm). Personally I boil the water first with half a Camden to a) drop out temporary hardness and b)drive out oxygen, so I generally start the boil, go and mow the lawn, then switch off and whilst it's cooling to mash temperature I get out all the rest of my brew gear and write the recipe.
Having mash water ready at 4pm would allow you to get the mash on, and then the pressure is off a bit - the mash doesn't have to be exactly an hour, and also doesn't have to have the heat on for all of it if you're insulated so it would be safe to leave the house empty when you went on the school run if that was necessary. Then you can either get the boil on during bathtime or leave it to mash until after 7pm, depending on how bolshy baby is being and how much your wife can help with baby.
One tip to knock half an hour off the process - use
isomerised alpha extract as the likes of Cloudwater do. It's still a good idea to boil for half an hour or so, but not having to isomerise hop alpha acids means you don't need to boil for 60+ minutes (although
some would disagree). You can even do no-boil (eg
here and
here) although that's kinda a different thing, it's not intended for long keeping.
Overnight mashing and then brew before breakfast seems to be a common route for many people with babies, if the baby is going to get you up at that time anyway then you might as well use it productively. I'm definitely a night owl though!