Ok I just scanned the blockchain myself. It looks like you're right 3 days over 3B were mined (not 12B). I stand by my statement though that this is a huge number in a short time. The noobs sadly were suckered thinking 100k coin for <1BTC was a good deal.
About the 66 days thing @ 50B coin, I understand this is >50% of the total supply. That's kind of scary as well. Not sure where dogecoin is going w/ the rapid ramp.
The extremely rapid ramp is my biggest concern for DOGEs survival. Miners will leave with each halving, leaving DOGE open for a 51% attack. And there are plenty of haters to do the attack. Also I'm sure at least a few real scumbags out there who would do it for financial gain. The weak development(?) team doesn't really help.
Still I wish the dog much success. Nobody has created brilliance out of stupidity this well since Monty Python.
Ed