Stock Market Recovery

[ann1act]

Somewhere I read (GCC or another blog?) that most of a recovery after a major downturn in various recessions happened in just 8 days or so. If you weren't invested in the market at that point, you missed the big rise. I can't seem to find the original article or the math that backs this up. Does anyone know about this? I'd really like to find the article. Sorry if I am being vague, but at the time I just skimmed the article. Thanks, Ann

[gocurrycracker]

I'm not sure either 

Here is an article that might be what you are looking for - if you missed the 10 best days over a 20 year period, your annual return dropped from ~5.6% to ~2%
https://www.fool.com/investing/2019/04/11/what-happens-when-you-miss-the-best-days-in-the-st.aspx