Depending on whether you mtl or dl or subohm etc., that sounds doable. Except if you vape several different flavors a day(like me) and then of course the time would increase, but still within the boundaries you set. The daily use may sound like a lot but if you subohm, you use so much more juice than mtl. It is hard for me to even guestimate how many mls I use a day since I have so many different flavors in daily rotation. Best I can do is note which flavor I fill more often. And that can change daily. LOL
I go through 5 - 8 flavors each day, maybe 10 or more each week. Adjusting my calculations for adding 10% - 15% flavoring to this unflavored, I should be good for 20ml a day for at least a year.