"Item Use Duration"

I haven't been able to set up this myself (any use animation I choose and any use duration I set, I see no animation).

Reading the wiki also didn't answer much. I don't know if this is a bug (2022.3 release, 1.19 generator), so I'll ask here anyway:

- What exactly doe "item use duration" do? Does it call the "finished using" procedure automatically after that many ticks? Does it force you out of the use animation?

- Do you need a certain animation for it to work? Does any animation (block, eat, drink...) work? Can you use an item with animation set to NONE?

- "use non-negative values for food". Why can the field be set to negative numbers, and why would I want to set use duration to negative?

Thank you for your time, and have patience.