My target was roughly $1.25M, but I'm at $1.4M now. That's stash, not net worth, but I have no debt. That's for 1 person. LCOL area.
My required non-dicretionary expenses are close to $22K/yr, which includes long term car/home maintenance costs and a future car sinking fund, while the stash can provide $53K/yr after taxes based on the 4% rule, I would definitely say I have a buffer of about $30K/yr, or about $25K/yr at 3.5% WR, but part of that will be used for discretionary expenses, like travel, entertainment, and dining out. They could be cut back on if needed, and I probably won't spend that much discretionary anyway if my history is any indication as I have a very high savings rate. SS benefits will start in as early as 10 years into FIRE, so that's another buffer, where my stash WR can drop to 2.2% while still providing about $53K/yr after taxes for living.
This assumes the ACA will be in place to purchase health care with some protections in place. So, I'm waiting to see how that plays out.