For those who posted about their TFB hive that has made it 3-5 years.
What is your secret?
Is it your location, your isolation from other colonies, or weather? It could be that you started with good stock, or even muts. Is there a particular management philosophy or do you mix and match to suit you?
You may not even know what it is. It just works for you. Or you're still on the learning curve to getting there (probably most).