For us quiet time is naps for littles and books for older kids (even if they can’t read yet) that’s quiet time is minimum of 2 hours for my non napper, if ds2 is still sleeping after 2 hours (almost always is) them dd4 can get up and we color, or bake, or start dinner prep.
Outside play for us is 30 min before lunch, so I can get it made in peace, and 30 min before dinner if the Mosquitos aren’t bad. We also like to go for family walks in the evening after dinner.
We also have independant play time every day we are home and not running errands. This consists of 1 hour of at time and entertaining yourself. Ds2 goes in a pack and play with 1-2 toys and plays. Dd4 is in the kids room and she can read or play dress up or what ever she chooses.
During independant play/room time (usually 9-10ish) do morning chore work laundry dishwasher stuff and shower and get dressed and pick 1 weekly chore to get done. During rest time in the afternoon (12:30-2:30/3) I usually sit for 30 min and read or nap, and then work on a project, do another weekly chore and fold laundry.
My kids are young. School consists of me reading to them during lunch and before bed. And my dd4 wakes up usually 1hr before ds2 so any “school” she does is before her brother gets up in the morning.
My kids both NEED independant time. On days where they don’t get that 1 he in the morning I can see a noticeable difference in behavior later in the day.
Sibling play is after breakfast from 7:30-9:30 ad that includes helping each other/me with their chores.