Roast the seeds on a baking sheet and they’ll keep, or refrigerate them if you don’t want to eat them right away. At least then you can see whether they’re going off, rather than just trusting the pumpkin doesn’t start rotting on the inside where it’s not visible before you get round to using them.
Just gut Jack and preserve his innards first, it’s safer.
Once you cut in and/or remove the seeds, they start to go off. You usually only get a week at most.
Painting instead of carving, it’ll last much longer.
Though, part of what makes them fun is their impermanence
Roast the seeds on a baking sheet and they’ll keep, or refrigerate them if you don’t want to eat them right away. At least then you can see whether they’re going off, rather than just trusting the pumpkin doesn’t start rotting on the inside where it’s not visible before you get round to using them.
Just gut Jack and preserve his innards first, it’s safer.