We can see here that the statement "On average, men spend more time at work than women" could potentially explain the earning disparity between men and women. If men, on average, spend more time in the workforce, it might result in higher earnings due to factors such as more work experience, longer hours worked, increased opportunities for career advancement, or the possibility of working in higher-paying positions or industries.
This explanation is reasonable because there is evidence to support the idea that men, on average, work longer hours or have higher rates of full-time employment compared to women. If men are working more hours or have more opportunities for full-time employment, it could contribute to their higher earnings.