It will also depend on the equipment you use and the delivery system. When I use a tank or clearo on my ego twist cranked to 4v, I go through more juice than my little ego mini with a horizontal coil cartomizer. I smoked about 1/2 pack a day of Marlboro Ultra lights, I vape 6 mg or less. I would estimate I average about 1-1.5 ml per day,30+ ml per month.
When I started I stuck to sample packs/6ml sizes until I figured out the flavors I like. I have several larger bottles I just can't seem to get through because my flavor preference has changed. Not that I don't like the flavor (I have been pretty lucky with flavors, not many major failures), just that there it so much juice and I don't vape it all the time.
With your vamo and a tank, you will probably go through more juice than I do...
Congratulations! Whatever you do, enjoy your vaping!!