The Ko' Olina docs state the same thing, for 15 days, which would imply calendar days. I did find it interesting that in the next paragraph addressing rescission they specifically say 'calendar days'.
https://www.sellingtimeshares.net/wp-content/uploads/Olina-Disclosure-Statement-.pdf
"RIGHTO F FIRST REFUSALTPOURCHASE. In the event an Owner desires to sell, convey or lease (or enter into other agreements relating to the use of a Unit if not designated as a "lease") for a term of three (3) years or more in the aggregate (and whether or not consecutive), or othewise transfer ownership of such Owner's Ownership Interest in the Program and for so long as Developer has Ownership Interests to sell in the Program or the Developer or an affiliate of Developer manages the Program, whichever shall he later, Developer shall have the right-of-first-refusal to purchase or lease, as applicable, the Ownership Interest under the same terms and conditions (including financing terms) as may be offered to or by a bona fide third party. Accordingly, each Owner desiring to sell or lease his Ownership Interest must notify Developer in writing of his intent to list, sell or lease his Ownership Interest. The Owner's written notice to the Developer must include the proposed listing, offer price or rental rate and general terms of the proposed listing, sale or lease.
Upon receipt of such written notice, the Developer shall have fifteen (15) days within which to notify the Owner in writing as to whether the Developer elects to exercise its right of first refusal set forth herein. If Developer electz_to exercise its right of first refusal, closing shall occur no later than sixty (60) days after Developer notifies the Owner in writing (within such fifteen (15) day period) of its decision to purchase the Ownership Interest. If Developer elects not to exercise its right of first refusal or fails to notify the Owner in writing of Developer's election to exercise its right of first refusal within such fifteen (15) day period, the Owner shall be entitled, for a period of seven (7) months thereafter, to list Owner's Ownership Interest with a third party resale agent or sell the Ownership Interest to a third party for a price equal to or greater than the price offered to Developer without further notice to Developer. In the event, however, that such third-party buyer is an entity other than natural persons or such persons' personal trust (such as a corporation, partnership, limited liability company or partnership or other business entity), the Owner shall then reoffer the Ownership Interest to Developer under the procedure set forth above to provide Developer with the option to exercise its right-of-first- refusal once again.
8. MUTUALRESCISSIOPNROVISION. BoththeDeveloperandanyBuyermaycancelanycontracttobuyan Ownership Interest without penalty by giving the other party written notice
within seven (7) calendar days after: (a) signing the contract; or (b) the Buyer receives this Disclosure Statement, whichever is later. The seven (7) day period is called the "mutual rescission period." Each Buyer will be given a form of Notice of Cancellation (Form TS-10 of the Department of Commerce and Consumer Affairs of the State of Hawaii ("DCCA)), together with all pertinent information completed at the time that Buyer signs the Purchase Contract. If a Buyer exercises this right to cancel, then, within fiffeen (15) days, the Developer must return all payments made and the Buyer must return all sales materials received in good condition, except for reasonable wear and tear, or the Developer may deduct their reasonable value (but not more than $25.00)."