How many economic crises have occurred in history? How long did it last?

There are four major global, major and economic and financial crises.

1: 1857 and 1920- 1922 The initial financial crisis only occurred in one or two countries (Britain and Italy).

2.1929-1933 "Great Depression" lasted for four years, 1973 "Stagflation" of capitalism lasted for ten years in capitalist countries.

3: 1997 "Asian financial turmoil", 1997- 1998 two years, affecting the whole of Asia.

4. The "American financial crisis" in 2008 (referred to as "subprime mortgage crisis") was unprecedented in scale and has not stopped yet.