I was thinking more "10 to 20". I suppose from person to person and at different stages of life the filter of who is appropriate for your playing field might change. . but even 10^2 seems high. I can barely name 20 critically important people in my life let alone those which are on my playing field. I have managed this, a bit unconsciously. Generally when my field is managed in line with my conscious values I'd only regard a person who I know and respect professionally. Further filtering on whether I actually feel like I personally (not just professionally) know the person.

curious what a different playing field mechanism might be described as