Gradually, the "corvée" system was reformed, both because of international criticism and popular resistance. In French West Africa, the "corvée" had been formalised by the local decree of 25 November 1912. Duration and conditions varied, but as of 1926, all able-bodied men were required to work for no longer than eight days at a stint in Senegal, ten in Guinea and twelve in Soudan and Mauritania. Workers were supposed to be provided with food if working more than 5 km from home, but this was often ignored. In 1930, the Geneva Convention outlawed the "corvée", but France substituted a work tax ("Prestation") by the Franch West Africa decree of 12 September 1930, whereby able-bodied men were assessed a high monetary tax, which they could pay via forced labor.