Over two days of testimony this week before Congress, Federal Reserve Chairman Jerome Powell indicated there's no imminent end to the central bank's balance sheet wind down process, as some banks have moved to push back their own end date for a process commonly referred to as quantitative tightening. “I think we have a ways to go” on reducing the size of central bank bond holdings and there are no signs yet that market liquidity has shrunk enough to affect the Fed's reduction in holdings of Treasury and mortgage bonds, Powell told a House panel Wednesday. Powell's observations on quantitative tightening, or QT, comes as the Fed has shed just over $2 trillion from its holdings.