Never take your lunch break before your boss does. Wait ten minutes after the boss leaves before you take your own break. This allows you the opportunity to take a long lunch without the boss knowing when you actually left. This is also known as "the oldest trick in the book."
Note: Complications arise when your boss is using the oldest trick in the book with his/her boss. Depending on how many upline supervisors you have, it could be 3 or 4 in the afternoon before you get to eat lunch.