Drops per hour is pretty hard to figure out. Everyone is different. I would guess that the best way to figure these things out would be by puffs per cartridge.
I'm at the point where I always have my e-cig and bottle handy. When vapor & hit deminish, I refill with a few drops, and continue. When I get condensation, I simply wipe it off. I never think too much about it any more. For me, it's just a matter of sitting back and enjoying without thinking about it.
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