Currently a Duration field (Whole number, Format: Duration) saves the value in minutes and shows it in minutes, hours or days (depending on the value). It would be good to have the option to change the way how the field shows a value to a fixed format ("Always show value in hours", "Always show value in minutes", "Always show value in days").
In a lot of businesses the primary value for measuring time is hours, so a value of 30 minutes should show as 0,5 hours in the UI and a value of 2 days should show as 48 hours.
This idea is only about the UI, saving it in the DB as minutes is fine.