(MSNBC) Obama says American kids spend too little time in school, putting them at a disadvantage with other students around the globe.

The president, who has a sixth-grader and a third-grader, wants schools to add time to classes, to stay open late and to let kids in on weekends so they have a safe place to go.

“Our school calendar is based upon the agrarian economy and not too many of our kids are working the fields today,” Education Secretary Arne Duncan said in a recent interview with The Associated Press.

‘Level the playing field’

“Young people in other countries are going to school 25, 30 percent longer than our students here,” Duncan told the AP. “I want to just level the playing field.”

While it is true that kids in many other countries have more school days, it’s not true they all spend more time in school.

Kids in the U.S. spend more hours in school (1,146 instructional hours per year) than do kids in the Asian countries that persistently outscore the U.S. on math and science tests — Singapore (903), Taiwan (1,050), Japan (1,005) and Hong Kong (1,013). That is despite the fact that Taiwan, Japan and Hong Kong have longer school years (190 to 201 days) than does the United States (180 days).

Strong case

Researcher Tom Loveless of the Brookings Institution looked at math scores in countries that added math instruction time. Scores rose significantly, especially in countries that added minutes to the day, rather than days to the year.

“Ten minutes sounds trivial to a school day, but don’t forget, these math periods in the U.S. average 45 minutes,” Loveless said. “Percentage-wise, that’s a pretty healthy increase.”

Summer is a crucial time for kids, especially poorer kids, because poverty is linked to problems that interfere with learning, such as hunger and less involvement by their parents.

That makes poor children almost totally dependent on their learning experience at school, said Karl Alexander, a sociology professor at Baltimore’s Johns Hopkins University, home of the National Center for Summer Learning.

Costly

Extra time is not cheap. The Massachusetts program costs an extra $1,300 per student, or 12 percent to 15 percent more than regular per-student spending, said Jennifer Davis, a founder of the program. It received more than $17.5 million from the state Legislature last year.

Aside from improving academic performance, Education Secretary Duncan has a vision of schools as the heart of the community. Duncan, who was Chicago’s schools chief, grew up studying alongside poor kids on the city’s South Side as part of the tutoring program his mother still runs.

“Those hours from 3 o’clock to 7 o’clock are times of high anxiety for parents,” Duncan said. “They want their children safe. Families are working one and two and three jobs now to make ends meet and to keep food on the table.”

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