Oddly Wired
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duration

You ignore the length of an experience in your memory.

Duration neglect is a heuristic where the duration of an experience is assigned little weight relative to the emotional 'peak' and 'end' of the event when forming a retrospective evaluation.

The primary experimental finding regarding procedure duration originated in Redelmeier and Kahneman (1996), not 1999.

You judge the quality of a chapter by the climax and the ending, not the number of pages.

Where this comes from

Study
Kahneman, 1999
What the check found
The definition is directionally correct, but the phenomenon is more complex than 'overlooking' duration, and the source/data attribution is imprecise.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.