I have 3 under 11, still a sahp, was horrendously difficult the first maybe 6 years or so but the load is so much lighter now they're older. Earlier years was;
Wake every hour/2 hours all night (for years). Then up for the day at 4.30am.
Spend the entire day just trying to survive the horrific sleep-deprivation/entertaining my extreme high needs baby/toddler who wouldn't nap/would scream/was incessently demanding.
Would put him down, screaming, to bed after nighttime routine around 7pm and pray to every God he would sleep. And repeat for a number of years.
Now, it's up 6.15am, walk dog, start packed lunch prep, clean kitchen/prep breakfast, school run 8.20am, home for 9am or grocery shopping/errands for an hour or two, home, walk dog for an hour, prep lunch if dh is home, laundry and tidying for a couple hours, prep dinner, go get kids from school, get them on homewalk whilst taking dog out for a wee, homework one hour, more laundry, dinner ready for around 5.30pm, tidy up dinner, 6pm - 7pm finish prep for tomorrow/get kids to help with chores. Bedtime wash for the younger two at around 7pm, 7.30pm get them ready for bed for 8pm, 8-9pm tidy up again/clean kitchen, put away food etc, sit with oldest for a half hour together, put oldest to bed around 9pm, sit for a half hour, walk dog again around 9.30pm, go upstairs to bed around 9.45pm/10pm, relax in bed for an hour. And repeat.