When is a function name too long?

Question

I try to be rather descriptive with my function names, where possible. This occasionally results in function names in the twenty to thirty character range such as \"GetActionFr

Answer 1

It may be a bit off topic, but as you asked specifically for a function name guideline (as opposed to say, method), I figured I would quote Linus Torvalds on naming (although it more refers to variables, but still - the principles hold).

Chapter 3: Naming

C is a Spartan language, and so should your naming be. Unlike Modula-2 and Pascal programmers, C programmers do not use cute names like ThisVariableIsATemporaryCounter. A C programmer would call that variable "tmp", which is much easier to write, and not the least more difficult to understand.

Short, descriptive names go well with short, specific functions... which go well with code reuse.