2 points
I’ve heard 4% rule, but for myself I use an investment firm that does monte carlo projections, with ages, spending rates, and current assets to give you a rough idea of likelihood of assets lasting till death.
Ive also played with a few of the retirement calculators made by the FIRE crowd i.e. https://www.schwab.com/learn/story/beyond-4-rule-how-much-can-you-spend-retirement
