With 6 options, there's a minimum of 50 votes and, from what I can see, a maximum of 125 votes at max inefficiency. (That's going to be a general pattern: the minimum is always (n-1)×10 for this vote setup, and the maximum will be no more than 21n-1, because there are 20n points to remove and ideal inefficiency "wastes" n-1 downvote points.)