Dorothy Parker? Lillian Day? Alexander Woollcott? Apocryphal?

Question for Quote Investigator: U.S. poet, critic, and fiction writer Dorothy Parker was famous for her witticisms. When discussing a prom, she said something like the following:
If all the young women who attended were laid end to end, I wouldn’t be at all surprised.
Would you please explore the provenance of this expression?
Reply from Quote Investigator: This quip was based on a popular family of expressions that were designed to help readers envision enormous quantities of items by placing them end to end and describing the resultant length. For example, in 1843 a newspaper in Liverpool England proudly described the massive number of pages produced by their printing press. Boldface added by QI:1
One day last month the steam-presses of the Liverpool Mercury threw off so many impressions of that paper, that if all the printed columns were laid end to end without any intervening space, they would reach over hill and dale, through town and country, the whole distance from Liverpool to London.
Below is an overview showing humorous variant statements with dates and source data:
1927 Aug: If all the college boys who slept in class were placed end to end they would be much more comfortable (“Judge” magazine acknowledged the “Cornell Widow”)
1927 Dec: If all the people who stay out most of the night were laid end to end they wouldn’t get up until noon.(“Judge” magazine)
1931: If all Ruby’s lovers were laid end to end, it would put them in a very awkward position. (Advertisement in “The Publisher’s Weekly” for a book by Lillian Day)
1934: Wholesale libel on a Yale prom. If all the girls attending it were laid end to end she wouldn’t be at all surprised. (Alexander Woollcott credited Dorothy Parker)
1945: If all the girls who attended the Yale Prom this year were laid end to end, I wouldn’t be a bit surprised. (Samuel Hopkins Adams credited Dorothy Parker)
1945 Jul: If all your lovers were laid end to end, I’d be very much pleased. (“The New Yorker” magazine acknowledged the operetta “Marinka”)
1967: Princeton prom: If all the girls were laid end to end, I wouldn’t be surprised. (Corey Ford credited Dorothy Parker)
1968: If all those sweet young things present were laid end to end, I wouldn’t be at all surprised. (Robert E. Drennan credited Dorothy Parker)
1974: If all the girls at Smith and Bennington were laid end to end, I wouldn’t be surprised. (Scott Meredith credited Dorothy Parker)
2003: If all the girls attending it were laid end to end … I wouldn’t be at all surprised. (Dominique Enright credited Dorothy Parker)
Here are selected detailed citations in chronological order.
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