by and by vs in a minute

by and by

adv

  • After a short time. 

  • After an indefinite period. 

noun

  • Heaven; the hereafter. Usually preceded with "the sweet." 

in a minute

prep

  • Within a short time, very soon 

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