As discussed in greater detail here, effective March 1, 2011, retail employers with 50 or more employees must provide employees working a consecutive 4-6 hour shift with a 15 minute nonworking break and must provide employees working more than 6 consecutive hours with a non-working break of at least 30 minutes. (if the 30 minute break applies, the employee is not entitled to a 15 minute break) For employees working 8 consecutive hours, employees must be provided with an additional nonworking break of 15 minutes for each additional 4 hours of work on that shift.  For shifts not exceeding 6 hours, the 15 minute break may be waived in writing. See Md.Code Ann., Lab. & Empl. 3-710.