Conversation so far:
who led the confederate army in the battle of gettysburg?
General Robert E. Lee  led the confederate army in the battle of Gettysburg
who were the other commanding officers in the Battle of Gettysburg?
Lieutenant General James Longstreet - First Corps. Lieutenant General Richard Ewell - Second Corps. Lieutenant General Ambrose P. Hill - Third Corps. Major General J.E.B.
who won in the Battle of Gettysburg?
The Battle of Gettysburg, fought in July 1863, was a Union victory that stopped Confederate General Robert E. Lee's second invasion of the North.
how many casualities at the Battle of Gettysburg?
50,000 men fell as casualties

Question: how long was the battle?
Self-contained rewrite: how long was the Battle of Gettysburg?