for the long haul vs till doomsday

for the long haul

adv

  • For a long time; for an extended period or duration; all the way 

till doomsday

adv

  • For a long time with no foreseeable end; indefinitely. 

How often have the words for the long haul and till doomsday occurred in a corpus of books? (source: Google Ngram Viewer )