The business of an urgent care facility will vary depending on the location of the clinic, the time of year, the clinic's hours of operation, the number of staff on hand, and what services are being offered.   Typically, urgent care centers are busiest during the days when other healthcare facilities are closed. For example, weekends tend to be much busier than weekdays, as many specialists and primary care physicians don’t work on Saturdays and Sundays. Holidays also tend to be busy as urgent care facilities tend to stay open whereas most other medical facilities (besides the ER) tend to close down.