According to Official Guinness Records,
The longest football (soccer) Serie A clean sheet is 973 minutes and was achieved by Gainluigi Buffon (Italy), at the Stadio Olimpico, Turin, Italy, on 20 March 2016. Buffon successfully kept 10 clean sheets for Juventus in Serie A before conceding a penalty against derby rivals Torino. The record previously stood at 929 minutes set in the 1993/1994 season by AC Milan keeper Sebastiano Rossi.
For a complete list of 2016 records, please visit 2016 Guinness Records in Italy.