Unfortunately, I don't have perfect info on my progression. Also, I tracked NW more closely than securities portfolio, so real estate has also played a big factor. I think I hit the $1M NW mark just before I turned 40. At age 50, NW was $2.5M, but this was just after the 2008 crisis, so was actually a depressed figure, as had hit $3M sooner in my mid 40's. From here things kinda took off with both stocks and r.e. Next couple years, added $1M per year. In recent history as approached 60, pace has slowed to about a million about every 3 years. Hard to generalize as it's been very lumpy, but I ain't complaining. NW is currently approaching $10M. Recently FIRE'd, early 60's, now making big adjustments to securities and r.e. holdings, which will mean some really big tax bills, so expect NW growth will slow as I write those jumbo tax checks and start to draw on portfolio, and also due to inflation and where we are in the market cycle. I will be delayed in hitting $10M NW, but will get there eventually, not so much as a goal, as just, that's what the base case projections show.
P.S. My conservative forecast in retirement is that portfolio (and NW) should continue growing about $1M every 4 years, as will be conservatively throwing off about $500K average in annual earnings vs total spending budget of ~$250K (including taxes). Much depends on how aggressively we spend as budget contains about 50% discretionary. Not looking to die rich, but on the other hand I think our spending will actually come down over time as we become more sedentary.
P.S. Worth adding that much as I'm a numbers guy and all these numbers are pretty accurate, it is just hard for it to seem remotely real to me. In my head, I am still a poor scrappy schub barely scrapping by who has got to keep working for the man to put food on the table. Adjustment to the FIRE'd life is just gonna take awhile.