Receipt of medical cannabis by a patient or caregiver from a dispensary may not exceed a 30-day supply of individual doses. During the last seven days of any 30-day period during the term of the identification card, a patient may obtain and possess a 30-day supply for the subsequent 30-day period. Additional 30-day supplies may be provided in accordance with this section for the duration of the authorized period of the identification card unless a shorter period is indicated on the certification.