The first thing that most clients and copy writers ask me when I produce sitemaps for new careers sites or when we're working on a strategy for content marketing is "How many words does the copy need?"
For me the real question is "What does the candidate need to know once they've finished reading the page" — and the word count should be a natural extension of then telling that message.
I get it though, I see similarities in this question with someone asking me to propose a new Careers without also telling me the budget they're working towards. We can briefly explain a concept in 200 words, but we could write a dissertation on it with 25,000 words.
This article takes you through a series of myths about page length and what you should consider when approaching the content.
My advice is to use enough words to provide the candidate with everything they need to know. No more, no less.
Ultimately, all of these guidelines have one thing in common: they’re designed to focus on your target audience. Personalize for them, engage them, and help make content readable for them, and they won’t steer you wrong.