My mom is a soon-to-retire nurse and she was a salaried employee who, if she worked overtime, made either time-and-a-half (1.5x) or double-time (2x) pay depending upon the situation.
But software developers, for all of the talk of ninjas and rockstars and whatnot, are a socially low and easily exploited class that make decisions against our own interests (laughing off the idea of unions, etc); so we often work up to 1.5 to 2 times (60-80 hours is very common) over our official salaried hours for free.