do personal checks expire?

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I wrote a check to some institution quite some time ago and they never cashed it in.

So far I always remember about it when I balance my checkbook, but it's a pain in the (3 letter word) to keep track of it. Luckily it is only 1 check I have like this, all other checks have been cashed in.

Once a year passes by, can I assume the bank will no longer allow them to cash the check? if not one year, then what? 5 years? 10?

Thanks