I just finished up 60ml of BWB juice today. That was 30ml of 555 and 30ml of Malty Toffee. My last order from them was on Dec 11 and I just got my replacement order today and only had 2 or 3 carts worth left.
So, that's 60ml/47= 1.28ml a day. That sounds low, but my wife says I vape like crazy. I did use some leftover Turkish to stretch the last couple of days, along with the last of the BWB, but I'd say 2ml a day would be heavy for me.