Comment by kraftman

It's been a long time since I've read the book but I took it to be less 'cut the function at X lines' and more 'long functions tend to be doing too many things at a time'. I think if you're able to give a good name to some sub section of a function, it's a good sign that it can be extracted out. At that point, you shouldnt need to look at the functions implementation unless its the specific function that you want to modify, because its name and arguments should be enough to know what it does and that you don't need to touch it.

Are we talking about the same thing and you'd still find that hard to understand?