Friday marked the day that my actual Enbridge usage matched the amount that they estimated for January 7th. Friday was the 28th of March. Note that it took 116 days to use the same amount of gas that they estimated I would use in 35. I am using 3 times less than they estimate.
My advice: Read your meters frequently, and correct them if things are hugely out of wack. They love your money, and if you don’t call, then they love your money more than you do.