38 C.F.R. § 21.74
(a) General. An extended evaluation may be authorized for the period necessary to determine whether the attainment of a vocational goal is currently reasonably feasible for the veteran. The services which may be provided during the period of extended evaluation are listed in § 21.57(b) of this part.
(Authority: 38 U.S.C. 3105(a), 3106(a))
(b) Duration. An extended evaluation may not be for less than two weeks (full or part-time equivalent) nor for more than twelve months, unless a longer period is necessary to determine whether achievement of a vocational goal is reasonably feasible.
(Authority: 38 U.S.C. 3105(a))
(c) Approval of the period of an extended evaluation.
(3) An extension beyond a total period of 18 months for additional periods of up to 6 months each may only be approved by the CP or VRC if there is a substantial certainty that a determination of current feasibility may be made within this extended period. The concurrence of the VR&E Officer is also required for this extension.
(Authority: 38 U.S.C. 3105(a), 3106(b); Pub. L. 99-576)
[49 FR 40814, Oct. 18, 1984, as amended at 53 FR 50957, Dec. 19, 1988; 54 FR 37332, Sept. 8, 1989; 62 FR 17707, Apr. 11, 1997; 81 FR 26131, May 2, 2016; 87 FR 8742, Feb. 16, 2022]