A joke about ordering pancakes in a restaurant is:
   
Diner: Waiter, I’m in a hurry! Will the pancakes be long?
Waiter: No, they’ll be round.
     
The joke was printed in many newspapers in June 1963.
     
“Diner: Waiter, will my pizza be long? Waiter: No, sir, it will be round” and “Diner: How long will my spaghetti be? Waiter: I don’t know. We never measure it” are similar jokes. “How long will the next bus be?”/“Same length as this one” is a related joke.
         
     
Newspapers.com
19 June 1963, Fort Worth (TX) Star-Telegram, “Fun Time—The Chuckle Box,” sec. 3, pg. 2, col. 3:
Customer: Waiter, will my pancakes be long?
Waiter: No sir, they’ll be round.
 
Google Books
September 1996, Boys’ Life, “Think & Grin,” pg. 61, col. 3: 
Customer: Miss, I’m in a hurry. Will the pancakes be long?
Waitress: No, they’ll be round.
—Anthony Marinello, Sterling Heights, Mich.
 
Google Groups: tw.bbs.talk.joke
pancakes
bear
Aug 6, 1998, 3:00:00 AM
customer:I’m in a hurry.Will the pancakes be long?
waiter:Oh,no.The chef will make them round!
     
Google Groups: alt.humor.puns
When I eat Pancakes
.(JavaScript must be enabled to view this email address)
Jul 6, 1999, 3:00:00 AM
An article said:
When I eat pancakes
..........I always usurp.~~~
I love syrup, but I use berry little of it.~~~
Maple you should use more. If you don’t use enough, they taste flat.
~~~~~
I can eat all the pancakes I want, as long as I use my 18-hour griddle.
~~~~I went out for breakfast the other day. It seemed like it was taking
 
forever to get served, so I said, “Oh, waiter! Will those pancakes be
long?” He replied: “No, sir; round, as usual.” ~~~~
     
Google Books
Extremely Good Clean Jokes for Kids
By Bob Phillips
Eugene, OR: Harvest House Publishers
2001
Pg. 130:
Man: Will the pancakes be long?
Waiter: No, sir, they will be round.
 
Twitter
8chapters32sections
@cmahadevan
Customer : I am in a hurry. Need something quick. Would pancakes be long ?
Waiter : No. They are usually round.
3:48 AM · Dec 19, 2009·Twitter Web Client
   
Twitter
Joseph Marek
@Josephmarek
............Waiter, waiter, will the pancakes be long? ............No sir, round.
7:41 PM · Jun 1, 2010·Twitter Web Client
   
Twitter
Smackin Good
@Smackin_Good
Customer: “Waiter, waiter, will the pancakes be long?” Waiter: “No sir, round.” #SmackinGoodHumor
3:56 PM · Oct 26, 2010·TweetDeck
   
Twitter
Pancake Print Co.
@PancakePrintCo
-Waiter, will the pancakes be long?
-No sir. They will be round.
7:25 PM · Nov 1, 2010·Twitter Web Client
 
Reddit—Jokes
Posted by u/prankerjoker July 11, 2021
Customer: Waiter, I’m in a hurry! Will the pancakes be long?
Waiter: No sir, round.