Rob G. I don鈥檛 think the window is channel-based, it鈥檚 just a 10,000 message history limit for the entire instance - to get at earlier messages in faq KGC would have to pay for an upgrade to the slack instance AFAIK.
No, that was my understanding as well from other Slacks. I was presuming that you intended to have accessible content in the FAQ, so suggesting that you repost that information.