By public local law, the county commissioners of a code county shall establish a specified number of days, not exceeding 45 days, in each year on which the county commissioners may meet to enact public local laws. Legislative days: need not be consecutive; and may be designated by public local law. If a legislative day is not specified or not determinable by public local law, the county commissioners shall publish notice of the legislative day in a newspaper of general circulation in the code county between 3 and 14 days before the legislative day. The first legislative session of a code county shall: begin on the first business day 60 days after the effective date of code home rule; and be 15 days long. The 15 days of the first legislative session do not count as part of the annual 45 legislative days. Each legislative session shall be open to the public.