May I ask how long it took to get there?
Twelve years, but don't view that as normal. Prior to 2011, I was pretty ignorant about personal finance and did not make good decisions about how much I was saving, asset allocation, etc. In fact, there was a period of 4-5 years where I didn't even contribute enough to get the full match (let the facepunches commence). Plus, 2008 saw about a 25% dip. I started 2012 with about $36k in there, and have steadily increased my contributions and rebalanced to an appropriate AA for my age. 2015 will be the first year I max it out. I plan to continue doing so; so I expect the next 100k will come much faster.