The time it takes for an object to reach the freezing point when placed in a freezer and subject to the opening and closing of the freezer door every minute depends on various factors, including the initial temperature of the object, the size and material of the object, the temperature of the freezer, and the frequency and duration of the door openings.
In a typical household freezer, the temperature is usually set to around -18°C (0°F). The freezer door is designed to maintain a relatively stable temperature inside, but each time the door is opened, cold air escapes, and warmer air from the room enters. When the door is closed, the freezer works to bring the temperature back to the set point.
The time it takes for the object to reach the freezing point will vary, but generally, the more frequently the door is opened, the longer it will take for the object to reach the desired temperature. This is because frequent door openings disrupt the cooling process and allow warm air to enter more frequently, slowing down the cooling rate.
If the object starts at room temperature (around 20-25°C or 68-77°F), it may take a few hours to reach the freezing point (-18°C or 0°F) under normal conditions. However, with the frequent door openings, it might take longer—potentially several hours or more.
Keep in mind that the rate at which an object cools depends on its size, shape, and material properties, as well as the efficiency and capacity of the freezer.
If you have a specific scenario in mind with exact timings, temperatures, and conditions, it might be possible to provide a more accurate estimate. But in general, the cooling process will be slower with frequent door openings than if the freezer door remains closed.