In Naples, he worked in 1572–1577 at the church of San Gregorio Armeno together with Giovanni Vincenzo della Monica. He helped design the Bank in Naples, called the second Monte di Pietà, started in 1539 with goal, according to Sasso, of liberating citizens from the supposed usury of the Jews. By 1597, the building was completed and unified all the banks in the city. In this project, he was aided by Giovanni Giacomo Di Conforto and Giovanni Cola di Franco.
Given this short summary of Giovan Battista Cavagna, how long did it take to build the second Monte di Pieta?
It took 58 years.  Started in 1539, completed in 1597.