To put the new taper program in perspective to the fed balance sheet recent trends. -It would take 24 years/until 2045 at $15B per month (all else equal) to reduce the balance sheet to Jan 2020 / pre corona virus level of $4.1 T. It would take 42 years to taper back to pre financial crisis levels of $900 B from August 2008.
And in case anyone forgot just how much $15 billion is - in SEC terms it would be the equivalent of spending the construction budget for Kyle field on every opponent in the SEC every month - in NASA terms it would be 6 Curiosity Mars missions per month. - in US Military budget perspective it would be the equivalent of a new Gerald Ford super carrier and 10 F35's per month.