It certainly can. If working on a big corporate deal where deadlines are critical.
One of my DS's (lawyer in a Magic Circle firm; arguably the most generous/ most solicitous employer of all of those firms) worked several fourteen hour days last week followed by an even longer day ending at 2.45am followed by going into hospital for an operation early on the fifth day.
That's purely for illustrative purposes.
His older brother (registrar in a London teaching hospital) is currently on a seven day week: several long days starting yesterday, then a normal day, then a long day then two normal days. You couldn't put any clear water between them in terms of hours.
oddandelsewhere makes some excellent points, clearly from a position of knowledge. Thanks for your grounded posts.