Native Mandarin Audio Transcription Needed

I have a batch of Mandarin-language audio files that I need converted into accurate written text. Because the material is intended for internal reference by native speakers, I’m only looking for native-level transcribers who can pick up on regional accents, filler words, and subtle speech nuances without relying on AI shortcuts.

Here’s what I expect:
• Verbatim or lightly-cleaned transcripts in simplified Chinese (please let me know if you can also supply traditional characters).
• Basic time stamps at regular intervals so my team can locate key passages quickly.
• A quick turnaround once a file is assigned, along with clear communication about progress or any sections that require clarification.

If you have previous experience handling Mandarin interviews, podcasts, meetings, or similar long-form recordings, I’d love to see a short sample or reference. Let me know your typical rate per audio minute and how many minutes you can realistically handle in a week so I can plan the workflow.