Keep in mind that this is showing the "reported" hours, which can be misleading. For example it shows that people in US works more than Japan but I know for a fact that people in Japan works A LOT more. However, since it is a cultural thing and they expect you to work long hours, no one reports overtime. I even heard that you can get fired if you report it.
(Using bikeshare ride data to determine peak hours and length of workday)
http://olivernash.org/2011/02/02/dublin-bikes-revisited/inde...