This is just me, but if painting just for yourself you be hard pressed to use a 2 oz jar in a couple of years. If selling then different story. I have jars of a lot of colors that I have had 6-8 years or more and haven’t even dented them. Pink, orange, chartruse and bright green I may buy one jar a year. Most of mine goes on the floor from me spilling it. Clumsy in my old age. I have a jar of clear I bought in a 1 lb bag from rosies probably 8 years ago and still have 1/4 lb left and I put it in everything.