The worst job in the world? Japanese swordsmith apprenticeship is advertised with ten-hour days, five-day weeks (plus weekends) for minimum five years... with NO PAY
The All Japan Swordsmith Association maintains strict requirements that stipulate all swordsmiths must 'train for more than five years' before they are able to qualify for certification
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https://www.youtube.com/watch?v=2GtLeaSpmi8