Question: how long did it take to build big ben in london?
Answer: Completed in 1856, the tower was designed by architects Charles Barry and Augustus Welby Pugin and took 13 years to build. Its construction required 2600 cubic metres of brick and 850 cubic metres of stone. It began telling time on May 31, 1859. Big Ben chimed for the first time on July 11, 1859.