The given graph depicts the annual teaching hours which had done by Primary, Lower Secondary, and Upper Secondary teachers in four countries, namely Japan, Spain, Ireland and USA in the year 2001.
Looking from an overall perspective, it is readily apparent that, almost in all countries, Upper Secondary school teachers had long teaching hours compared to other schools with the exception of Ireland. This is followed by Lower Secondary Schools in the USA and Ireland, while Japan and Spain had similar and much lower hours of teaching in 2001.
General, Japan and Spain had similar graphs because they both had 600 hours in Primary and Lower Secondary schools. Additionally, another similar point is their Upper Secondary schools had longer classes than other schools. For Japan it showed approximately 680 hours, and for Spain even higher than this, almost 1000 hours.
Looking at the other countries, teaching hours in primary school had the lowest numbers, 600 hours for Ireland and roughly 880 hours in the USA. In both countries, Secondary schools had similar numbers, but it varied for the country, such as Ireland had almost 800 hours and the USA had about 1500 hours.