I have worked in several places, my last employer was an accounting firm where I was the Director of Administration, prior to that a college prepatory school as the Assistant Development Director, and before that the Assistant to the Controller for a very large apparel service in the United States and Canada (think uniforms and bathroom towels).
I think the kind of specified "break times" you are thinking of are more of a blue collar/union thing...the law in Minnesota is actually pretty vague...
http://www.dli.mn.gov/LS/WorkBreaks.asp
"The state law requires employers to provide restroom time and sufficient time to eat a meal. If the break is less than 20 minutes in duration, it must be counted as hours worked.
Time to use the nearest restroom must be provided within each four consecutive hours of work. Meal time applies to employees who work eight or more consecutive hours (see Minnesota Statutes 177.253 and 177.254)."