Maybe Static-Guard only lasts a day when used as intended...on clothing. Or maybe they tell you that because they want to sell Static-Guard.
My vinyl records, once wiped with a very thin layer of Static-Guard, retain their completely static-free properties indefinitely. I also find that film holders certainly don't need to be treated every day, although I do retreat them lightly when I reload them on the theory that they are handled roughly. It's no a magic bullet, but it really helps to treat plastic that otherwise is a complete static-magnet. I really think plastic film holders are a giant step backward from wood and metal ones.
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