By not confusing actually doing work with being kept busy for 16 hours to please the "company" / "boss".
Plus, it's not like this happens everytime and for everyone. People in Greece work longer hours than most of Europeans.
http://www.washingtonpost.com/news/morning-mix/wp/2014/05/16...
Japan has its own word "inemuri" for the practice of sleeping on the job, which is sometimes even faked to make it look like they're working hard. http://en.wikipedia.org/wiki/Inemuri
Recently this practice has become more accepted company policy. http://www.japantimes.co.jp/opinion/2014/06/07/editorials/po...
Huh. Definitely not a part of American work culture - it's likely you'll wake up with a pink slip taped to your face.
I could as well take a nap and then get back to work with renewed energy.
Given the right architecture (high ceiling, verandah, stone walls) a shift in work day like this can offset high temperatures without using huge amounts of electricity for air conditioning.
PS: Judging by the Chinese overseas students I meet I think 16 hour work days may become a memory in a generation or two.