How long is School at home?

Like you, we are locked down at home.  How long should you do school each day?  The short answer is, ‘School has finished when the work is finished.’  Reality is three-four hours each day for the nine year old and five-six hours each day for the freshman, five days a week.  We start at nine, break for lunch at 12:30, finish school work with Paul by 2:00.  Lacie, a freshman, works after lunch until 2:30-3:00, depending on the assignment.  When Paul finishes work after lunch, we take him outside for 45 minutes to an hour to give Lacie some peace.  The two work in different spaces in the house, too.  School work is usually written work.  We do experiments, guitar, bike riding, games, puzzles, and reading after school work.  Nope, we do not take frequent breaks during the morning.  We switch assignments and vary activities.  We discourage breaks.  We encourage completion of assignments.  What is our secret?  WiFi is frozen.