There exists a problem in defining a "battle", for the line between "battle", "siege", and "campaign" is a blurry, fuzzy one.
Indeed, the longer a "battle" goes, the better change is gets called a "siege" or broken up into smaller battles grouped together as a "campaign".
In ancient times, a battle generally could not last more than a couple of days - sufficient supplies were not available, and military strategy didn't encompass the idea of long-term combat. Sieges were generally distinct from battles, in that the siege was usually an occupation around a fixed geographic point, often with little actual combat.
In modern times, industrialization and technology have led us to "continuous combat" - that is, actual, significant fighting occurring throughout the day and night (though, not at the same time in all sections of the conflict), continuing on for weeks or months.
There is no real answer to your question, as it depends on arbitrary lines being drawn between a siege, a campaign, and a battle.
oh you know. . . only as long as birth
116 years
The battle of good versus evil or obedience versus disobedience as detailed in the book of Genesis (commonly refered to as 'the Fall').
Gettysburg 1-3 July 1863
battle of the bulge
The Battle of Kursk involved 780,900 Germans and 1,910,361 Russians. The combined forces suffered 1,066,303 casualties.
The Battle of the Bulge, fought against the Germans, in Belgium, during the winter of 1944-45.
Battle of Towton was the largest and most bloodiest battle fought.
Gettysburg 1-3 July 1863
Bentonville
The largest battle was located at Mine Creek. It was called the Battle of Mine Creek.
battle of the bulge
The Battle of Kursk involved 780,900 Germans and 1,910,361 Russians. The combined forces suffered 1,066,303 casualties.
The Battle of the Bulge, fought against the Germans, in Belgium, during the winter of 1944-45.
The Battle of Bentonville was the largest and most important battle of the Civil War fought in North Carolina. There was one battle during the Revolutionary War fought in North Carolina-- The Battle of Guilford Courthouse.
The battle of Towton fought on March 29, 1461
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brooklyn
Battle of Towton was the largest and most bloodiest battle fought.
The battle of Palmetto Ranch.