Income & expenses:
Household income is approx USD 220k per year, not including bonuses, stock options or ancillary benefits (which can be material). My family of four lives in one of the most expensive cities in the world (Hong Kong). With two kids, private school, and a live-in helper it takes USD 12k/month to run the family. The rest goes to taxes, savings, and discretionary income (in that order). I do not consider myself wealthy.
How much I need:
Once school bills and mortgage payments subside, my wife and I (currently age 35) could comfortably live on USD 100k per year to support our hobbies, some of which are relatively expensive. At a 5% draw down this would require savings of USD 2 million today, or an inflation adjusted USD 5 million by the time we retire in 30 years. Those figures protect the principal ad infinitum, but if i did not plan to leave money to the kids I could budget it to last until age 115 and retire with considerably less in savings. Although Hong Kong recently introduced a mandatory retirement scheme, it is relatively tiny and cannot be relied on like social security like the U.S. Therefore, all retirement support must come from personal savings.