Successful businesswomen such as Facebook's Sheryl Sandberg tend to be target of questions about how they make time for family, but the truth is that work-life balance is an issue that affects both men and women, writes Margaret Heffernan. Women entrepreneurs often start their own businesses to attain flexibility that is not available at traditional jobs. "Parents don't mind working hard. They do mind working in rigid environments that won't accept that there is a life beyond the job," she writes.

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