(1) A public hearing on the petition shall be held by the county legislative authority of the county in which the proposed fire protection district is located if: (a) No boundary review board exists in the county; (b) jurisdiction by the boundary review board over the proposal has not been invoked; or (c) the boundary review board fails to take action on the proposal over which its jurisdiction has been invoked within the time period that the board must act or a proposal is deemed to have been approved. If such a public hearing is held by the county legislative authority, the hearing shall be held not less than twenty nor more than forty days from the date of receipt of the petition with the certificate of sufficiency from the county auditor if there is no boundary review board in the county, or not more than one hundred days from when the notice of the proposal was submitted to the boundary review board if the jurisdiction of the boundary review board was not invoked, or not less than forty days after the date that the boundary review board that has had its jurisdiction invoked over the proposal must act if the proposal is deemed to have been approved. The hearing by the county legislative authority may be completed at the scheduled time or may be adjourned from time to time as may be necessary for a determination of the petition, but such adjournment or adjournments shall not extend the time for considering the petition more than twenty days from the date of the initial hearing on the petition.

(2) If the proposed fire protection district is located in more than one county, a public hearing shall be held in each of the counties by the county legislative authority or boundary review board. Joint public hearings may be held by two or more county legislative authorities, or two or more boundary review boards, on the proposal.