Ms. McIntyre is just one 20-something — a population historically exploitable as cheap labor — learning that long hours and low pay go hand in hand in the creative class. The recession has been no friend to entry-level positions, where hundreds of applicants vie for unpaid internships at which they are expected to be on call with iPhone in hand, tweeting for and representing their company at all hours.

“We need to hire a 22-22-22,” one new-media manager was overheard saying recently, meaning a 22-year-old willing to work 22-hour days for $22,000 a year. Perhaps the middle figure is an exaggeration, but its bookends certainly aren’t. According to a 2011 Pew report, the median net worth for householders under 35 dropped by 68 percent from 1984 to 2009, to $3,662. Lest you think that’s a mere side effect of the economic downturn, for those over 65, it rose 42 percent to $170,494 (largely because of an overall gain in property values). Hence 1.2 million more 25-to-34-year-olds lived with their parents in 2011 than did four years earlier.

The young are logging hours, too. In 2011, according to the Bureau of Labor Statistics, full-time workers ages 20 to 24 put in just 2.1 fewer hours a week than those 25 and over. That’s not a big gap of leisure for the ostensibly freewheeling time in one’s life. Or, to quote Lena Dunham’s 24-year-old aspiring writer in “Girls,” “I am busy trying to become who I am.”

A recent posting by Dalkey Archive Press, an avant-garde publisher in Champaign, Ill., for unpaid interns in its London office encapsulated the outlandish demands on young workers. The stern catalog of grounds for “immediate dismissal” included “coming in late or leaving early without prior permission,” “being unavailable at night or on the weekends” and “failing to respond to e-mails in a timely way.” And “The Steve Wilkos Show” on NBCUniversal recently advertised on Craigslist for a freelance booking production assistant who would work “65+ hours per week” (the listing was later removed after drawing outraged comments when it was linked on jimromenesko.com).

“The notion of the traditional entry-level job is disappearing,” said Ross Perlin, 29, the author of “Intern Nation: How to Earn Nothing and Learn Little in the Brave New Economy.” Internships have replaced them, he said, “but also fellowships and nebulous titles that sound prestigious and pay a stipend, which means you’re only coming out with $15,000 a year.”