"The Blitz", or heavy bombing of London by Germany in World War II, occurred over approximately how many days?

Stedra7, they forgot to mention Coventry which was badly damaged .

Stedra7, where are you getting 11 weeks from?

This is wrong London was only bomb for 77 days Night after night, from September 1940 until May 1941, German bombers attacked British cities, ports and industrial areas. London was bombed ever day and night, bar one, for 11 weeks. One third of London was destroyed. Blitz is a shorten form of the German word 'Blitzkrieg' (lightning war). 11 weeks is 77 days