Final answer:
The requirement for how often a Pharmacist in charge must be on duty varies by location and is set by state boards of pharmacy or equivalent regulatory authorities. This person is generally required to be on duty whenever medications are being dispensed to ensure patient safety and compliance with legal standards.
Step-by-step explanation:
The specific requirement for how often a Pharmacist in charge must be on duty can vary depending on the laws and regulations of the state or country where the pharmacy is located. Generally, state boards of pharmacy mandate that a Pharmacist in charge or another licensed pharmacist must be on duty any time the pharmacy is dispensing medication to the public.
This could range from being there for all operating hours to a certain percentage of the time, which is usually set by the regulatory authority. It is important for the pharmacy to comply with these regulations to ensure the safety and accuracy of medication dispensing. You will need to refer to your specific state or regional pharmacy laws for the exact requirement.