Depends on the memoir. "I saw the building burn down" may not be much of a reminiscence but it is one.
Memoirs of Many in One was created in 1986.
Memoirs of a Dervish has 288 pages.
The Costello Memoirs has 400 pages.
Memoirs of a Spacewoman has 176 pages.
Memoirs of Hadrian has 347 pages.
Memoirs of a Geisha has 448 pages.
Prison Memoirs of an Anarchist has 512 pages.
The Memoirs of Naim Bey has 84 pages.
The Memoirs of Sherlock Holmes has 279 pages.
The Memoirs of Solar Pons has 245 pages.
Memoirs of a Fox-Hunting Man has 395 pages.
The Posthumous Memoirs of Bras Cubas has 238 pages.