From my experience, most women refuse to put in the hours necessary to succeed. The people who become CEOs and high level executives work eighty and ninety hour weeks for years on end. I worked for a major TELCO and the vast majority of women technicians refused to work overtime unless coerced by management. For them it was eight and go home, many times I saw them walk off jobs leaving customers out of service until another tech could be dispatched.
Good for them. Why should they let their job eat up their entire lives?
If the company has too much work for the staff to handle, hire more staff, don't just make people work longer.