From May 19 until July 4, 1863
potato
240 days
5 Days
The siege of Leningrad lasted 871 days from 8th september 1941- 27th January 1944.
6 months June to Decemberr 1266
Six days.
It started on 8th Sept 1941, and lifting of the siege took place on 27th Jan 1944 - some 872 days after it began.
Newark Castle is not under siege. No castles in Britain have been under siege in the last several hundred years.
Siege of Petersburg
siege
Thirteen days.
Sieges could last many weeks or months, depending on the quality of the siege artillery, the usage of siege towers and scaling ladders (both of which did not require destroying defences before invasion) as well as supplies for the attackers and the defenders. Attrition due to a lack of food supply or disease were often reasons for sieges to last a much shorter time than they would have done otherwise.