20 C.F.R. § 260.7
If a claimant waives his or her right to appear at a hearing and the hearings officer does not schedule the case for hearing, or the evidence in the record supports a favorable decision without a hearing, or a hearing is not required pursuant to § 260.5(g) , the hearings officer shall make every effort to issue a decision within 90 days from the date the appeal is filed: Provided, however, that if the hearings officer requests additional evidence it shall be requested within 45 days of the filing of the appeal and the hearings officer shall make every effort to issue a decision within 30 days after the additional evidence is received and the appellant comments on the evidence, or if no comment is received after the close of the comment period.
20 C.F.R. §260.7