How long is a personal check valid for?

 Six months. A bank is not obligated to honor the check after the validity date.

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New York Uniform Commercial Code
The New York Uniform Commercial Code Article 4-404
URL: http://assembly.state.ny.us/cgi-bin/claws?law=122&art=32
Contact: Consumer Representative
Phone: 18005223330 or Fax: 2126186440