about time vs high time

about time

adv
  • Far past the desired time. 

  • Close to the right time. 

  • Used other than figuratively or idiomatically: see about, time. 

high time

noun
  • A point in time at which something is considered to be utterly due or even overdue to occur; well past time 

  • A very enjoyable or exciting experience or period of time. 

How often have the words about time and high time occurred in a corpus of books? (source: Google Ngram Viewer )