For personal goods in tourist traffic, the largest border crossings are open 24 hours a day, Monday through Sunday, and are staffed by border guards. Special opening hours apply at airports. Numerous small border crossings, however, are open only at certain times, while some are no longer manned at all. Please note the customs office opening hours for the declaration (customs clearance) of merchandise. Declarations can be made from Monday to Friday during clearance hours; some customs offices are also open on Saturday mornings.