I looked it up in the owners manual for the Toyota Corolla available online.

(While I haven't driven a Toyota Corolla with adaptive cruise control, I have driven a Subaru Forester, which uses roughly the same following distance; I find it to be a little closer than I'd prefer on my own, but accept it for the convenience and because I assume it can get away with a shorter following distance, since it is not reliant on human reflexes to stop in an emergency.)