Given the current results, it's 14 - 12 against a six month rule.
That's not what it looks like to me.
It's also 50% in favor of "use your own discretion", which based on your own posting history is not an approach that you would seem to prefer. Presumably you'd prefer it even less if and when posters felt that six months was more than they felt they should be held to.
I was going to post this, but you've already taken care of it. Well done.