how many hours a day to work to get lunch in ,a
In the United States, most states require a minimum 30 minute lunch break if you work at least 5 or 6 consecutive hours. Federal law requires you to receive one paid 15 minute break every 4 hours you work (so if you work a normal 8 hour day, you will get two 15 minute breaks).
For every 4 hours you work you should get a 15 minute break. You have to work 6 hours for a 30 minute break and I think its 8 hours for an hour break. In a day of 8 hours duty, the lunch break will be after 4 hours and a tea has to be served or will be taken within the campus in 2 hours before that.