Are you immigrating or just coming for a visit? If you are just coming for a visit then you have to go through customs and if you have filled out the correct forms from the airplane prior to landing then you should not have a problem. The only hold up is dependant on the number of planes landing from out of the country. The more planes the longer it takes to get through, Some airports such as New York, Los Angeles, San Francisco and Atlanta are usually busier then other airports. If you have 8 planes landing at the same time and have thousands having to go through customs, then you are going to have a long wait time. Unfortunely we have no control over the number of planes landing due to the length of time it takes to get from Europe to the U.S. Almost all planes leave at the same time over there and arrive here at the same time.