SARFAESI act

Sec 9 sub section 4 of Security Interest (Enforcement) Rules, 2002 provides for time limit of 15 days or extended time as mutually agreed by authorized officer and highest bidder for payment of balace 75% of final purchase price.

How many days in addition to 15 days, an authorized officer can grant to highest bidder for payment of 75 % amount?

Whar are extents of discretionary powers of authorized officer to grant extention of time?

Thanks