Hawaii Organic Act § 51

That if the governor neither signs nor vetoes a bill within ten days after it is delivered to him it shall become a law without his signature, unless the legislature adjourns sine die prior to the expiration of such ten days.

If any bill shall not be returned by the governor within ten days (Sundays excepted) after it shall have been presented to him, the same shall be a law in like manner as if he had signed it, unless the legislature by their adjournment prevents its return, in which case it shall not be a law.