Jędrzej Edward Moraczewski  was a Polish socialist politician who served as the first Prime Minister of the Second Polish Republic between November 1918 and January 1919. He had previously served as Minister of Communications. Subsequently, from 1925 to 1929, he served as Minister of Public Labour. Moraczewski died on 5 August 1944 when he was hit by shrapnel fired by a Soviet soldier into his house. He was buried at Powązki Military Cemetery.
Question: For how many years did he serve as Public Labour Minister?
Answer: 4