interminably vs round the clock

interminably

adv

  • in an interminable manner; (seemingly) endlessly 

round the clock

prep

  • nonstop, 24 hours per day. 

noun

  • A variant of the game of darts in which players attempt to hit each section of the dartboard sequentially, from lowest to highest number. 

How often have the words interminably and round the clock occurred in a corpus of books? (source: Google Ngram Viewer )