Yes, you can make ice in a freezer overnight. The time it takes to freeze water into ice cubes depends on various factors, such as the temperature setting of your freezer, the size of the ice cubes, and the efficiency of your freezer. However, under normal circumstances, most household freezers should be able to produce ice cubes within a few hours.
If you want to ensure that you have a sufficient amount of ice by morning, it's recommended to leave the water in the freezer for at least 6 to 8 hours or even longer. This should give ample time for the water to freeze and form ice cubes.
It's worth noting that factors like the initial temperature of the water and the ambient temperature in the freezer can also impact the freezing time. Using colder water (but not hot) and keeping the freezer closed as much as possible will help speed up the freezing process.
If you need a large quantity of ice or have a specific event planned, it's best to prepare well in advance and give the freezer plenty of time to do its job.