(1) Service limits. Agencies may make temporary appointments for a period not to exceed 1 year, unless the applicable Schedule A, B, C, or D authority specifies a shorter period. Except as provided in paragraph (b)(3) of this section, agencies may extend temporary appointments for no more than 1 additional year (24 months of total service). Appointment to a successor position (i.e., a position that replaces and absorbs the original position) is considered to be an extension of the original appointment. Appointment to a position involving the same basic duties, in the same major subdivision of the agency, and in the same local commuting area is also considered to be an extension of the original appointment.