Penn Wharton
https://mba.wharton.upenn.edu/mba/admissions/faq/#Q12
"The average student has worked for 5 or 6 years between college and the MBA program. The Admissions Committee looks for individuals who exhibit professional maturity. In other words, we evaluate work experience not in terms of years but the depth and breadth of an individual's position, his or her contributions to the work environment, and level of responsibility and progression. Wharton looks for diversity in the professional backgrounds of its admitted students just as it does in all other parts of our applicants' profiles. No one industry is favored over another, and experience in a Fortune 500 company does not have higher value than experience in a small business or public institution."