Question regarding the Smok Alien with the TFV8

Hello everyone! Weird question incoming.

Due to the size of my GX350, and the fact that the damn TFV12 heats up like hell, I decided to "downgrade" to a Smok Alien and the TFV8. I used to vape on the TFV8 for about 6 months and was 110% happy with it, so that's why I decided to go for it instead of others. I do know about the possible issues on the Alien, however a friend is going to sell it to me for a hell of a low price, so it's a risk I'm willing to take. Plus, I love the design!

Problem is, I will be using the TFV8 with the Q4 coils (0.15Ω) at around 120w. Would that be "too much" for a dual battery mod, meaning could it dry out the batteries in a matter of two/three hours?

I mean, I have no problem swapping batteries say, two times daily, or every six hours, that comes with vaping these tanks at high wattage. But sooner than that would be somewhat unpractical.

Anyone using the same kit who can say whether or not I will have issues on battery autonomy?

Thank you in advance!

Edit: small additions