English to Czech Other Other Audiobook narration

Hi guys,

Could you be so kind as to help me, please? I'm looking for a Czech payment term similar to what's used in English-spoken audiobook recording, which is "Per Finished Hour" (PFH). Basically, it means that the book narrator gets paid for the completed, edited, mastered audiobook depending on its final length in hours/minutes. If there's nothing of the kind, an approximate equivalent will do.

Thank you very much in advance!