70 or above
Oh no, it wasn't a quote to your comment.
The whole concept is pointless. It depends on position. If your opponent blunders he would make it easier for you to score higher result. Therefore, it mainly depends on the opponent (and the position), but to be honest, to SOME extent also on your skill level. As an example, I win random queen vs rook position with 95 to 100% even against the strongest stock fish level. I doubt every grandmaster could achieve the same result playing the same endgame against me.
What a joke
70 or above