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1. According to the number of meals: In regular restaurants or hotels, it is usually one change per customer, that is, each customer will change a new napkin after finishing their meal to ensure hygiene for the next customer. In family meals, if there are multiple people gathering together, it is also possible to consider changing one napkin per meal and keeping it clean.

2. According to usage: If the napkin is significantly soiled during use, such as with a large amount of food residue, oil stains, alcohol, etc., it should be replaced in a timely manner in order not to affect the dining experience and hygiene. For example, when eating hot pot and other dishes that are prone to splashing soup, if a napkin splashes too much soup, it needs to be replaced immediately.

3. By time interval: In some high-end restaurants, if the dining time is long, napkins may be changed for customers at regular intervals (such as every half hour) to keep them clean and fresh. But this is not a common practice, and restaurants generally do not change napkins based on time.

In addition, for some special occasions such as business banquets, formal banquets, etc., in order to reflect the quality and details of service, the replacement of napkins may be more frequent and timely. In some casual dining occasions, such as fast food restaurants or daily family meals, the frequency of changing napkins may be relatively low, mainly based on actual needs.