For European countries you might find this link useful:
http://www.nfer.ac.uk/nfer/index.cfm?9B1C0068-C29E-AD4D-0AEC-8B4F43F54A28In Scotland and England, compulsory education (which can be homeschooling) begins at age 5. In practice, children in Scotland typically start school between the age of 4.5 and 5.5, and children in England start between the age of 4 and 5. In England, if you insist on your right to have them not start until they are 5, you practically always miss out on the first year "reception" of school. In Scotland, there is more flexibility, and children who are in the youngest few months of the year group often have entry deferred till the next year, e.g. might start in August in the first year ("P1" in Scotland) age 5y6m instead of 4y6m.
School is always full days, though some schools have a settling in period which is half days.
