Working women put in longer hours on the job last year, spent more time caring for their children and did more work around the house than they did a year earlier.

They also spent less time relaxing or socializing—and less time sleeping.

Those results, from the annual American Time Use Survey released Wednesday by the Labor Department, hint at the challenges that working women face when juggling life’s various obligations.

Despite their increasing workplace commitments, they remain the primary caregivers and organizers of their households.

Employed women worked about seven hours and 20 minutes during the average workday last year, the most time spent on the job since the survey began in 2003. Men spent slightly less than eight hours a day on the job. The gap between the average workday for women and men has fallen to its smallest on record.