actually, IIRC the federal minimum full time standard is 32 hours.
That is a bunch of crap. I work 40 hours a week and am considered part-time. I am unable to work over 40 hours a week and if I were to work 12 hours one day I have to take off 4 hours the next day. There are no benefits and no paid vacation or holidays since I am part-time.
This is a matter generally determined by an employer. Many people mistakenly believe that full-time employment consists of 40 hours per week. However, the federal Fair Labor Standards Act (FLSA) does not define full-time employment or part-time employment. The FLSA does require, however, that overtime pay be paid after 40 hours of work in a workweek. This may be the reason many employers cap full-time employment at 40 hours per week.