Chewing/eating time?

[JP_Finn]

What is the trigger for eating time? As in how long it takes to consume a meal/cut/fish?
Is it hardcoded or is it something like calorific content?
I'm pretty sure it is not weight or preservation/preparation method as roasted bear cut takes same 7-8 minutes as dried bear cut.

I would think dried&slow smoked foods to take longer to chew/masticate/eat than roasted/boiled/salted.