Accuracy of transcription.duration Whisper

Hey, so right now I am doing the chunking method as recommended by the docs to process files larger than 25mb however, I am curious if the transcription.duration time is the actual full audio duration? Because on the next chunk I need to add this time to all start/end times. But can I trust it to have the exact audio duration of that chunk? Or should I do it some other way?

Thanks