Tenure-track academics often receive a contract where they are told to subdivide their time according to certain percentages between teaching, research and service (service generally can refer to serving on university-wide committees, mentoring students, or serving roles in professional organizations), for instance 40% teaching, 40% research, 20% service. While academics do not use billable hours and many do not keep track of our hours the percentages of time are seen as a guideline on how to structure their labour.