[Torwald]

I think Joels has it right in his assessment of hours vs days: https://www.joelonsoftware.com/2000/03/29/painless-software-...

In another piece somewhere he also states, that the engineer working on the thing should estimate the hours, because everyone has a different skillset and that then relates to the task and how long it takes.

[spmvg]

This is a really good find, thanks for that. It's from 2000 and still relevant. Added an issue to support hours: https://github.com/spmvg/open_it_maintenance_planner/issues/...