The time it takes for water to freeze into ice in a typical freezer using standard ice trays can vary depending on several factors, including the freezer's temperature, the initial temperature of the water, and the size of the ice cubes in the tray. However, under normal conditions, it usually takes around 3 to 4 hours for the water to become solid ice.
Keep in mind that if the freezer is very full or if the room temperature is relatively warm, it might take a bit longer for the water to freeze. On the other hand, if the freezer is set to a very low temperature or if the water is already quite cold when you put it in the freezer, it might freeze a bit faster.
To speed up the freezing process, you can set your freezer to a colder temperature (but avoid setting it too low as it may affect the other items in the freezer), ensure the freezer is not too crowded to allow for better airflow, and use water that is already chilled from the fridge instead of room temperature water.
Remember that being impatient and opening the freezer frequently to check on the ice can slow down the freezing process as well since it lets warm air into the freezer. It's best to leave the water undisturbed in the freezer until it has had sufficient time to freeze completely.