I use a dual 18650 mod with a .21 setup in my rda (dual coils) get 2 days of battery usually and pretty easily too tbh
Ofc if i'd be to use my single 18650 mod, then i'd most likely get less than a day. Though dripping seems to make me go through less liquid in a day (haven't counted as there's no tank to XD, i just know i drip when i feel like vaping).