Federal law does not require meal breaks. When one is given, it can be unpaid only if you are fully relieved of duty, usually for 30 minutes or more. Eating at the expo station while you watch your tables is work time.
Many states require a meal break. A few examples: California and Colorado after more than 5 hours, Washington for shifts over 5 hours, Oregon at 6 hours, and Minnesota at 6 consecutive hours. Timing and waiver rules vary.
A few states owe extra pay when a meal break is not provided. See break premium and rest break.
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