Hawaii Revised Statutes Division 2. Business § 431:10-226.5

In the case of cancellation of a policy, the insurer shall give written notice to the insured not fewer than ten days prior to the effective date of cancellation. For nonrenewal of a policy, the insurer shall give written notice to the insured not fewer than thirty days prior to the effective date of nonrenewal. If under title 24 or a policy, a longer time period is required for a notice of cancellation or nonrenewal for the policy, the longer period shall be applicable. Cancellation or nonrenewal shall not be deemed valid unless evidence of mailing is provided.