0.
E liquid is not a cigarette. You
vape different amounts than smoked, its like asking chocolate cake is how much spaghetti simply because they both contain sugar. Or 1 chocolate cake is how much soda.
If you want an answer, quickest we can give you is I
vape a bottle every 3-4 days. I used to smoke 18 cigarettes a day.
But e liquid is not cigarettes and is not transferable in to a number of cigarettes. How fast you go through depends on your
device, power, build, voltage, more liquid means more cloud and flavor...etc