about time vs prematurely

about time

adv
  • Far past the desired time. 

  • Close to the right time. 

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

prematurely

adv
  • In a premature manner; too soon or too early. 

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