“Just one or two recalcitrant passengers at an airport is all it takes to cause huge delays,” said Paul Ruden, a spokesman for the American Society of Travel Agents, which has warned its more than 8,000 members about delays resulting from the body-scanner boycott…

Pat-downs often take up to four minutes, according to the TSA’s website, though that could be longer if someone requests it be done in a room out of public view or if an ill-at-ease traveler asks for a full explanation of the procedure beforehand.

Factoring in those time estimates, it would take a total of around 15 minutes to put 100 people through a body scan – but at least 6 hours to pat down the same number of travelers.