It's probably very variable, but I'm also curious how many responses the people posting to get hired are getting.
We get a handful when we first post, and a couple trickle throughout the month afterward.
Last time we posed something (freelance dev deposition) we got about 4 applications . 1 with no qualifications , 2 with unrealistic hourly rate , ... And one who we hired and working with since.
Posted for a unicorn specialist-generalist in NYC, was pleasantly surprised to get one applicant (who didn't pan out).
We got 8 for a remote-friendly frontend dev position.