I'm sorry. I forgot to mention I take reading daily after airlock activity stops. When I get 2 days back to back same readings, I know its ready to bottle.
Because, well, I understand chemistry.
But I take my previous statement back. I had a Kolsch in primary for 14 days, due to some dry hopping I did in the primary after gravity was reached. I don't currently use a secondary, and have never had issues with under fermented beer or "bottle bombs". I personally think letting beer sit for 3 weeks is prety useless advice myself, especially when most beers will have been done LONG before that.
Thats the great thing about brewing. its REALLY hard to do "wrong". If you follow the few basic rules, you're going to end up with beer. everything else is personal preference.
Also, the phrase you're looking for is "
chock-full".