Maybe 50 mL or so in a month (maybe less). I take hits and enjoy them, but I rarely leave the house with my PV (nowadays), and even when I can vape incessantly, I don't. I always enjoy vaping much more when I have had breaks--be it, 1, 2 or 3 hours. In an average day, I vape no more than 2 mL (if using regular attys). The days I use my eBaron Dripper Pro, I can easily triple that amount (if not more) which is why, although I love the vape, I don't use the eBDP that much (running through liquid, to me, doesn't make a good deal of sense). More power (LOL) to those that burn through liquid like it's on tap.