I can save paint in the freezer for at least a week.
I paint almost every day and squeeze out new paint as I use it up so it's hard to tell how long it lasts, exactly. However, the colors I don't use up very quickly last a long, long time. Paints that dry quickly in the open air also dry more quickly in the freezer (like umbers). Slow drying paints (like Gamblin's Alizarin Permanent) last longer since they dry more slowly in the open air too.
Two hours a day to mix up a full palette of colors sounds like a huge amount of time -- and an awful lot of money scraped off at the end of each day.
You can greatly improve your color mixing abilities by using that two hours each day to actually paint!
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