Hi TENDTO
I'm a SAHM at the moment too and as much as it sounds mental I love cleaning! Though our home is somewhat smaller than yours, 3 bedroom flat which houses me, DP and DSx2 (7 years and 9 months).
I have a daily routine:
Put baby DS for a nap at 10am - he will sleep until 11:45am
Once he is sleeping I will do the following:
Have a quick tidy of big DSs bedroom, make bed, throw laundry into hall, pick up stray lego then hoover (it's the only room with carpet). Takes about 5-10mins.
Next is the bathroom, Bleach toilet, sink and bath and let soak, bring out old towels and swap for fresh ones, sweep into hall.
Then the living room, tidy mini DSs toys, wipe down table and mantle, wipe down sofa, and sweep into hall.
Kitchen, unload dishwasher, reload dishwasher, bin anything lying around. Spray sides with Dettol, put washing machine on, wipe sides and hob.
Back to bathroom, flush toilet, rinse sink and bath, crack a window.
Quick Sweep of hall and make sure shoe cupboard is neat.
Once mini DS wakes I tidy and sweep our room (he still shares with us) then heat his lunch while I mop the house.
After lunch I empty the washing machine and hang the washing.
On Saturdays I sweep and mop the 3rd bedroom as it's just an empty room at present. Then I clean the oven and kitchen cupboards (I shop on Sundays so it's more so see what's there, than they need cleaning every week). Sundays I wash bedding curtains and windows and Hoover the mattresses.
Once a month all doors, tiles and skirting boards get a good scrub. Pillows and duvets also get done once a month, as do soft toys.
I find it much easier if you don't have a lot of clutter (or a nice big storage place to hide it all like me).