Who knows when this outlandish mass multiple expansion party will end. It will though, they always do; and they always end badly.
Curious historical fact regarding the present context in terms of liquidity / loose money: 5 of the 6 times the Fed has contracted its balance sheet in US history, it has occurred immediately prior to a recession. [1] That's interesting because we're facing a potential double liquidity tightening, with rising interest rates and a contracting Fed balance sheet (supposedly, we'll see if they ever get around to serious balance sheet reduction before the shit hits the fan, I'd wager it's a very slow moving feint meant to restrain asset prices, similar to them threatening to raise rates for years prior to actually doing so).
[1] https://www.cnbc.com/2017/08/02/fed-balance-sheet-reduction-...