Prompt Enhancer is optional and enabled by default. With it enabled, 0 estimates duration automatically and a value above 0 overrides it. With it disabled, an explicit duration greater than 0 seconds is required, including when reference audio or text is provided.
Enabled by default: prepares the task and instruction. Keep duration at 0 for automatic estimation, or enter a value to override it. When disabled, a duration greater than 0 is required.
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With Prompt Enhancer: 0 = automatic estimation; values above 0 override the duration. Without Prompt Enhancer: enter a value greater than 0.