Quick question to mathematicians in the audience

A body is in freefall. Assuming normal gravity, how much distance will the body drop after, say, twenty seconds? Thirty seconds? I know the basic formula is 32 feet per second/per second, but math was never my strong suit, plus there’s probably other aspects of physics I’m overlooking.

Or, put another way, a body dropped from about a thousand feet high: How long until it hits the ground?

PAD