It is not surprising that food processing plants or catering industries usually work for six days. I'm afraid of working overtime every day after six days. The general working hours are from 9: 00 to 5: 00 pm, and some businesses are from 8: 30 to 18: 00. Such manufacturers and businesses are not uncommon. If you want to work there, you must ask first, and don't come back for a few days. I don't think it is necessary.