Four years
Harriet lane was james buchanans neice and James was never married so while he was president Harriet was the first lady
Harriet Lane was married to Henry Elliott Johnston. Lane was the niece of President James Buchanan. Since Buchanan never married, she acted as First Lady.
All of them. The only president not to be married was James Buchanan, but his niece, Harriet Lane, served as First Lady.
His niece , Harriet Lane was his White House hostess, since he was not married.
James Buchanan was a life-long bachelor, so his niece , Harriet Lane, served as his first lady. She was 27 when he took office and so was younger than a typical first lady and she was still single . She was an orphan and Buchanan had been her legal guardian.
Harriet Lane, adopted niece of James Buchanan
The term First Lady was first coined in 1860, in reference to Harriet Lane the White House hostess for her bachelor uncle, President James Buchanan. Before that the presidents wives were popularly known as "Lady ......." as in President and Lady (Washington, Maddison etc....).
The 15th president, James Buchanan was not married so his niece, Harriet Lane, performed the duties of White House hostess.
Harriet Lane Levy was born in 1867.
Harriet Lane was born on 1830-05-09.
Harriet Lane Levy died in 1950.