Under the law, there are no guidelines that determine whether or not an employee is a full-time employee. It depends on company policy and practice of defining just what constitues a full-time employee. The standard for full-time has been 40 hours per week but many employers consider employees as full-time if they work over 30 hours, etc. And conversely, a part-time employee can work as many as 40 hours per week (and be ineligible for benefits).