Final answer:
Lavatory checks on international flights are typically conducted periodically throughout the duration of the flight, and the frequency can vary depending on the airline and flight duration.
Step-by-step explanation:
In international flights, lavatory checks are typically done periodically throughout the duration of the flight. The frequency of these checks can vary depending on the airline and the length of the flight. However, it is common for lavatory checks to be conducted at least once every couple of hours.
The purpose of these checks is to ensure that the lavatories are clean, well-stocked with supplies, and in proper working condition. The flight attendants or cabin crew are responsible for performing these checks and addressing any issues that may arise.
For example, on a long-haul flight, lavatory checks may be done every 2 hours to ensure passenger comfort and maintain hygiene standards. On shorter flights, the checks may be less frequent.