How long do I have to be absent in order to count as "stopping"? I wouldn't be surprised if I had no activity for a week or two at some point, by virtue of being busy with other things.

@IsaacKing as strict criteria would make it prone to manipulation this is a "I'll know it when I see it" thing, I'll consult with other Trustworthy-ish users in case it is not clear to me.