Every month, analysts at Credit Suisse publish a survey of real estate agents in about 40 metro areas. Their observations are occasionally local, but often big

When and how big would be the next Stock market and/or real estate market crash and/or correction in the US?

Nobody knows. People might claim to know but anyone claiming they do is just guessing.

There are lots of possible triggers: the Fed raising rates, automation leading to mass unemployment, pension and healthcare promises leading to State insolvency. Nobody knows when or how big the next crash will be.