[Python] Should I use Django's `FloatField()` or `DecimalField(`) for audio length?

Using duration = float(ffmpeg.probe(audio_path)["format"]["duration"]), I collect an audio/video's length and want to store it using my models. Should I use models.DecimalField() or models.FloatField()? I use it to calculate and store a credit/cost in my model using credit = models.DecimalField(max_digits=20, decimal_places=4)

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