"The economy is in a completely different place than it was when we ended asset purchases the last time," Powell said during a Senate confirmation hearing. "The period of time between stopping purchases and beginning runoff will be shorter, and also the balance sheet is much bigger so the runoff can be faster."

Powell noted that policymakers are still debating approaches, and said it could sometimes take two, three or four meetings for them to make such decisions.

(Reporting by Jonnelle Marte, Editing by Franklin Paul)