- Source: List of longest diaries
- Ed Sheeran
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- List of longest diaries
- Diary
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This is a list of diaries notable for their exceptional length, primarily by word count but also by duration.
William Matthews, in his British diaries: An annotated bibliography of British diaries written between 1442 and 1942 (University of California Press, Berkeley and Los Angeles, 1950) lists 400 diaries with a duration of 30 years or more.