English version comes after Japanese.
有給休暇って国際労働機関（ILO）が定めた条約があって連続して取るものなんです。1年勤務につき3労働週以上（5日制なら15日以上）、連続で2労働週以上（同10日以上）取得すると定められていますが、日本は批准していないんですねぇ。
I understand some people in Japan are proud of not taking any leaves because those people had a great experience in succeeding in their business during the high-growth period in 1970's and 80's. In their standards, longer they work, better they should be evaluated.