Lettland

We have labour laws. Search in likumi.lv
IIRC you can work 12h max in a shift and you myst have 12h between shifts. There were also some rules regarding max h in a week and max shifts in a row.

12 hour shifts is normal but if you work more than that months base hours (august 176 hours) than for each hour above that you should get paid +100% rate.