Research on the effects of timetabling
There has been a tendency in recent years for schools to make the length of teaching-periods longer ... but research shows that this is probably a mistake in terms of the Effectiveness of learning.
There has also been research on 'spaced learning' and starting the school day later, that you may wish to take into consideration when planning your timetable and scheduling.
For more details on the research, see Research on the Effects of Timetabling
By the TimeTabler Team