No one should work 8 hours straight but something like 7.00-15.00. Spain also has a mandatory break after 6 hours of work (15 mins and up) and it counts as working time.

In the steel industry there are three working times, 6.00 - 14.00, 14.00 - 22.00, 22.00 - 6.00 much better than working from 9.00 to 14.00 and from 15.00 to 18.00.