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Rendering a frame which lasted about 1/24th of a second in the film can take up to four days because of the complexity of the underwater environment with sunlight coming through the water and hitting fish scales.
IMDb, Finding Nemo (2003) Trivia
Film Editor: David Ian Salter, also edited Toy Story 2 (1999) and Ice Age: Continental Drift (2012)
Not entirely editing related, but we all know how time consuming rendering can be.