2 days ... GOD HELP ME .... this is not mentioning that I have over 200ml of DIY juices sitting there too!
But seriously, I buy stuff just to check out flavors I haven't tried. Mostly "gourmet" stuff. I have some Gambit incoming this afternoon; never had it. Anything that is simple like Strawberry, banana, etc. I don't buy at all anymore. I just make it.
In reality, I don't need to buy any and would not have needed to buy any for over 6 months. Basically since I started doing DIY. I also just got a liter 100mg (thanks MFS) and that will last me a very very long time I suspect.