downtime vs happy hour

downtime

noun
  • A period of time set aside for rest and relaxation; leisure time. 

  • The amount of time lost due to forces beyond one's control, as with a computer crash. 

happy hour

noun
  • Any small gathering, usually in the afternoon or early evening, set aside to relax and have a drink. 

  • A time of day, usually in the afternoon or early evening, when a bar or pub offers its drinks at a discounted price. 

  • Flowers. 

How often have the words downtime and happy hour occurred in a corpus of books? (source: Google Ngram Viewer )