docs: fix Limitations — audio duration instead of prompt length

README.md

@@ -101,7 +101,7 @@ No public sample output is currently declared for this checkpoint.
 - No public benchmarks for this checkpoint are declared in the model metadata.
 - No public benchmark claims are made by this card unless listed in the frontmatter.
 - Validate outputs on your own domain data before relying on this checkpoint.
-- Memory use and speed depend heavily on the exact Apple Silicon generation, unified-memory size, and prompt length.
+- Memory use and speed depend heavily on Apple Silicon generation, unified-memory size, audio duration, and language complexity.
 
 ## License