Is cracking a sha256(x) the same runtime as sha256(sha256(sha256(sha256((x)))))? I remember the first time I saw bitcoin's double use of sha256 like this, and I

Is cracking a sha256(x) the same runtime as sha256(sha256(sha256(sha256((x)))))? I remember the first time I saw bitcoin's double use of sha256 like this, and I was confused as to whether there is a security benefit to this.