As an example of this...

During the pandemic, I took almost a year off from work of any sort. I had eliminated all of the expenses I had that I wasn't deriving real value from, and estimated how much I'd need to have in the bank to afford the time of no income. Then I saved up that amount.

At the end, I'd overestimated by about 4x and learned a great lesson about how much money I actually need to live in the manner that I prefer.