I want a field in which I can enter a duration. HH:MM:SS
  1. Duration field: this would need to be usable in a function.
  2. Time formatting for formula custom field: To make the duration field usable in functions, the function field must have the option to output in HH:MM:SS format.
Use Case:
As an audiobook narrator, I make each chapter to record a "task". I need to have a field in which I can record how long that chapter's audio file is. This is DIFFERENT than time tracking. Though I want to be able to do that too. And then to compare the two numbers with a formula to determine my productivity (Time spent/File length= a percentage)
I also would want to use this field in a formula to determine how long an entire book is through a SUM function.
This would also require the formula field to be formatted to appear as a time in HH:MM:SS. This would be important so that I could estimate how long each chapter is through a formula (Number of Words/Reading Speed= estimated length of entire book in HH:MM:SS; then Estimated length of entire book /Number pages=Reading time per page in HH:MM:SS; then Reading time per page * number of pages in each chapter=estimated length of chapter in HH:MM:SS)
I use this kind of feature in Airtable for audiobook narration work. I would use ClickUp instead, but without the duration it is prohibitively unusable.