leave of absence vs long weekend

leave of absence

noun
  • A period of time during which a person is absent from work or other duty for a reason other than normal holidays/vacation; may be paid or unpaid. 

long weekend

noun
  • A weekend extended by one or more days off falling on a day or days immediately preceding or following it. 

How often have the words leave of absence and long weekend occurred in a corpus of books? (source: Google Ngram Viewer )