The hearing on the proposed boundary change shall be held by the board of supervisors of the conducting county on the date and at the time specified in the resolution adopted pursuant to Section 23206. The board of supervisors of the conducting county may hold the hearing jointly with the board of supervisors of the other affected county. At the hearing, the board of supervisors shall hear testimony from interested persons and receive any oral or written protests. Any person who filed a written protest may withdraw it at any time before the conclusion of the hearing. The hearing may be continued from time to time, not to exceed 45 days from the date specified in the resolution.