What's the longest time antimatter was able to be stored?

What's the longest time antimatter was able to be stored?
Depends on the type of antimatter you consider. Positrons and antiprotons can be stored for months in penning traps. I guess many years would be possible, but no one seems to bother keeping them that long.

More antiprotons ("no antiproton losses were detected over a period of several month")

Neutral antihydrogen is significantly harder to store, as it is not charged. The ALPHA experiment at CERN manages to store atoms for something like 15 minutes - probably more now but I didn't see anything new after 2011.

Vanadium 50

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For pbars, I believe the record is 69 days, 10 hours, 18 minutes, from the Fermilab antiproton accumulator. This happened between 26 March 2004 and 4 June 2004.

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