I have thought that too - if they keep the same listing up for too long, I may wonder if there's some reason why they can't hire and/or keep employees. If your

I have thought that too - if they keep the same listing up for too long, I may wonder if there's some reason why they can't hire and/or keep employees. If your company is actually trying to fill multiple identical positions, it's probably best to make that clear somehow - that they're growing rapidly and the listing isn't for a specific position so much as that they're always open to hiring anybody who has the right qualifications.