how long can i store used cooking oil before processing it ot biodiesal

i have used cooking oil how long can i store it for use in making biodiesal

I have stored wvo that I have

I have stored wvo that I have filtered for over a year. I put a purge of argon on the oil so there is no contact with air. Argon is heavier than air so a few minute purge and good to go.

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