In professional captioning, "hours" are used to estimate work effort.

Depending on what you are looking for, it likely falls into one of these categories: 1. AI Video Tools & Subtitling Credits

: In fan-subbing communities (like those for K-dramas or Vtubers ), "subtitle hours" refers to the massive amount of volunteer time spent translating long-form content for international audiences. Why are my books being blocked? - KDP Community

The phrase is frequently used as a descriptive subtitle for journals, puzzle books, or musical compositions.

: In technical posts, "subtitle" might simply be the label for a chart's secondary title, such as "Subtitle: Hours worked by health professionals" in a data report. 3. Professional Labor

: A common subtitle for Sudoku or activity books is something like "Subtitle: Hours of Number Fun" .