Arianna Huffington says 5 p.m. is not for interesting jobs

Arianna Huffington says people with interesting jobs cannot simply shut their laptop at 5 p.m. She told Fortune that work for those jobs has no natural ending, and that if someone finishes everything before bed, they do not have an interesting enough job.

“I don’t think there is anybody with an interesting job who can do that,” Huffington said. She added that if you can complete everything on your to-do list every day, “You should change jobs, because any interesting job means that things are not complete day by day.”

Huffington on work and sleep

Huffington said she stops working when the important things are done, but usually has work left over for the next morning. She also said most adults should aim for seven to nine hours of sleep a night unless they are rare true short sleepers with a genetic mutation.

She tied that view to how she approaches her own schedule. “It’s important not to think in terms of hours, but in terms of fuel for yourself,” she said. “Have you given yourself the fuel to renew yourself, to recharge yourself, and start again?”

The Huffington Post and Thrive Global

Huffington co-founded The Huffington Post in 2005 and later sold it to AOL for $315 million. She now runs Thrive Global, and has built a $100 million net worth. She also said, “Work is also incredibly fulfilling. I love my work. I actually don’t really separate my work from the rest of my life.”

Her comments come after years of warning about overwork. In 2007, while building Huffington Post, she passed out in her home office from exhaustion, hit her head on her desk, broke her cheekbone, and woke up in a pool of blood.

That history gives her latest message a practical edge for younger workers deciding where they draw the line. Huffington’s view is not that every long day is a warning sign; it is that unfinished work can be part of jobs she considers worth keeping, while a perfectly finished day may mean the job is too small.