N.H. Rev. Stat. Ann. § 265:91-c

Where a license or driving privilege has been suspended under RSA 265:91-a and the person is also convicted on criminal charges arising out of the same event both the suspension and the court ordered revocation shall be imposed but the total period of suspension and revocation shall not exceed the longer of the 2 periods; provided, however, that any suspension for refusing to submit to a test under the provisions of RSA 265:92 shall not run concurrently with any other penalty imposed under the provisions of this title.