Miners of the Don Basin. In the USSR the shortest working day in the world is in operation. The length of the working day in industry is seven hours. The worker in the mining, chemical and other branches of industry work six hours per days, in all. The hugh sum expended by the state insurance(social), education, health protection, etc., ensure the right of every worker to rest and measure, free medical aid, free education-- of any kind up to and including university education-- for the worker and his children, and a secure old age. April 24, 1939.