This habit is mainly about conservation rather than health. In some households, people follow the idea of flushing less frequently when there is only urine, especially during droughts or in places where saving water is important.
However, leaving urine in the toilet for too long can create odors, stains, and mineral buildup. Toilets should still be flushed regularly and kept clean, and flushing immediately is generally preferable when sharing a bathroom with others or when hygiene is a concern.
The main lesson is that reducing unnecessary flushing can save water, but it should be balanced with cleanliness and comfort. Using a modern dual-flush or water-efficient toilet is another simple way to conserve water without changing bathroom habits dramatically.
