While that's fair, a lot of the time isn't active cooking, as in you fiddling with and adding things and all the like. It's at best baby sitting to check it every once and a while, make sure it doesn't burn your kitchen down, maybe add water if its boiling too hot, etc.

Time taken vs actual time spent working is super low.

Hell, you can make your own broth if you can find a good butcher to get materials from and are able to leave a stove going for hours and hours.

Look up "Just One Cookbook." Fantastic ramen and broth recipes.