A pumpkin is essentially a large squash...

...so if you don't breach the internals, it should last for many years.

I still have some small pumpkins that I use each year for our Halloween displays at home...it's been five years!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car