My builds are all 24g kanthal, dual coil, 7 wraps each @ .3 ohms (roughly, usually more like .28). Running at 30W, I would probably go through one 5ml tank a day if I stayed with that tank all day. And I do tend to chain vape quite a bit. Hope that gives you a good reference.
As for battery usage, I can usually get almost a full day from a single 18650, two days from a dual 18650 mod and maybe three days from my RX200S (haven't fully tested this yet). But that will all depend on the cell you use and what wattage you run it at.
I'm a man, and I can change, if I have to, I guess.