After the adoption of a comprehensive plan, all amendments to it shall be recommended, and approved and adopted, respectively, as required by § 15.2-2204. If the governing body desires an amendment, it may prepare such amendment and refer it to the local planning commission for public hearing or direct the local planning commission to prepare an amendment and submit it to public hearing within 60 days or such longer timeframe as may be specified after written request by the governing body. In acting on any amendments to the plan, the governing body shall act within 90 days of the local planning commission’s recommending resolution; however, if a comprehensive plan amendment is initiated by the locality for more than 25 parcels, the governing body shall act within 150 days of the local planning commission’s recommending resolution. If the local planning commission fails to make a recommendation on the amendment within the aforesaid timeframe, the governing body may conduct a public hearing, which shall be advertised as required by § 15.2-2204.