Congrats, and welcome to ECF.
It's not how long the nova will last, it's a atomizer. But that is dependent on so many variables. What kind of
juice are you using? VG? PG? what resistance are you currently using on your clearomizers? What's the voltage when you vape? How often?
I'm on a low nico (12mg) on a Nova tank @2.4ohms at 3.6-4.0 volts. I have nova
tanks, and they pretty much last an entire day on a full tank using an MVP. I usually fill up at the end of the day so that when I'm off to work or do whatever I need to do the next day, my MVP and I are ready to go. Haven't attempted to ProTank, so I can really say how long those will last.