N.H. Rev. Stat. Ann. § 236:46

Any person whose rights or interests shall be affected by such location may, within 60 days after the approval of the selectmen, as provided in RSA 236:43, but not afterwards, petition the selectmen for such changes in the terms of the location as he may desire; and, after notice to parties and hearing, the selectmen may alter or revoke said location as justice may require.