I try to keep at least 100ml of my daily vape on hand, I ordered 200 last time and I've still got about 140ml left. I've got about 20 other flavors in various sizes also, but they don't see much action. I've just started doing DIY and have enough nic juice to make around a liter of juice in whatever flavors I get a hankering to try. Most of it will likely go into vanilla tobacco, or butterscotch tobacco flavors though. All told I've got around 400ml of premade juice I would guesstimate along with the nic juice. I'm set for over a year, probably closer to a year and a half.