CBI had pleaded for the 14-day remand for Sethi but Special Chief Judicial Magistrate Padmalochan Satpathy allowed the agency only 10 days.
CBI had also pleaded with the court to club eight cases against Sethi together.
Sethi's lawyer, however, opposed the plea and pointed out that his client had already been taken on remand eight times by the police.
Sethi and Padhi were arrested by Odisha Police last year.
CBI had earlier arrested one AT director Sambit Khuntia and one of the founding directors Joytiprakash Joyprakash in connection with their alleged involvement in the multi-crore rupee chit fund scam, better known as Saradha scam.