Earl of Burlington is a title that has been created twice, the first time in the Peerage of England in 1664 and the second in the Peerage of the United Kingdom in 1831. Since 1858, Earl of Burlington has been a courtesy title used by the Dukes of Devonshire, traditionally borne by the duke's grandson, who is the eldest son of the duke's eldest son, the Marquess of Hartington.

Can we draw the following conclusion?
Earl of Burlington is not a real title.
No