Are you going to a set if the pitcher just stands there?

If hands are not yet together, I'm with you; kill it. If she steps off or separates without a pitch, she abandoned the pitch.

If the pitcher has brought her hands together and is still on the pitchers plate, I'm waiting, as she has neither started a pitch nor abandoned the pitch sequence. After 10 seconds (5 in NCAA), she has created a 2nd illegal pitch, but that hardly matters.