title: Li Linfu
context: Li Linfu (Chinese:李林甫; pinyin:Lǐ Línfǔ) (died January 3, 753[1]), nickname Genu (Chinese:哥奴), formally the Duke of Jin (Chinese:晉公), was an official of the Chinese Tang Dynasty, serving as a chancellor for 18 years (734–752), during the reign of Emperor Xuanzong—one of the longest terms of service for a chancellor in Tang history, and the longest during Xuanzong's reign.[2]
question: When did Li Linfu serve as chancellor of the Tang Dynasty?
answers: 734–