This code system http://hl7.org/fhir/v3/EmployeeJobClass defines the following codes:

CodeDisplayDefinition
FTfull-timeEmployment in which the employee is expected to work at least a standard work week (defined by the US Bureau of Labor Statistics as 35-44 hours per week)
PTpart-timeEmployment in which the employee is expected to work less than a standard work week (defined by the US Bureau of Labor Statistics as 35-44 hours per week)