It is generally considered courteous to avoid doing laundry in a building during early morning or late evening hours to minimize disruption to other residents. In most cases, it is best to wait until mid-morning or early afternoon to do laundry, when there is likely to be less demand for the machines. However, it ultimately depends on the specific policies and rules of the building regarding laundry usage. If you have a busy schedule and limited free time, it may be helpful to coordinate with other residents to establish a mutually convenient laundry schedule.