I've heard of delayed gratification only in this century. Obviously not taught at school during the last century. But I see, we practiced it. There was the first unit of delay, the "term". Then the end-of-year exams, where one - yes only _one_, could win a prize, usually a book. Then came two year delay before the G.C.E. exams. Inhuman, compared to today's accepted attention-retention spans.
;)
===
`Yes, we went to school in the sea, though you mayn't believe it--'
`I never said I didn't!' interrupted Alice.
`You did,' said the Mock Turtle.
`Hold your tongue!' added the Gryphon, before Alice could speak again. The Mock Turtle went on.
`We had the best of educations--in fact, we went to school every day--'
`I've been to a day-school, too,' said Alice; `you needn't be so proud as all that.'
`With extras?' asked the Mock Turtle a little anxiously.
`Yes,' said Alice, `we learned French and music.'
`And washing?' said the Mock Turtle.
`Certainly not!' said Alice indignantly.
`Ah! then yours wasn't a really good school,' said the Mock Turtle in a tone of great relief. `Now at ours they had at the end of the bill, "French, music, and washing--extra."'
=== The Mock Turtle's Story,
https://www.cs.cmu.edu/~rgs/alice-IX.html