Companies should, by default, avoid scheduling meetings that start before 10am or end after 5pm. If an employee comes to the office at 8am on some days, it is often to use the two hours of the morning before meetings to catch up and/or get a head start on the day. Meetings that start before 10am are often harmful overall since they put the attendees in reactive catch up mode for the rest of the day. Similarly, meetings that go on beyond 5pm (or worse, start after 5pm) take away valuable time from employees that they use to absorb information and events of the day, catch up with replying to email and get ready for the next work day.
i.e. Companies should consider any time outside the 10am to 5pm window to be not available for meetings and definitely not any weekly recurring meetings.
Preferably, employees who are ‘makers’ should have one 4-hour continuous block of time each day when they are free from meetings. (‘Makers’ differentiated from ‘Managers’)