$20k is the sweet spot for me. I think I'm floating around $19k since I borrowed $1k as part of my buy-in to VTSAX in my taxable account, which I was excited to finally start. Very likely, though, I'll max out my Roth IRA on January 1 by using money from this account, then slowly rebuild it.
For some reason I've tended to fear lots of things happening at once. Job loss, major car issues, etc. In reality this rarely happens, and it hasn't happened to me. So what if it's a down market and you have to sell a few shares at a deflated price? I guess I just like having a huge lump of cash, but I'm very dedicated to not keeping more cash, as a way of combating my own fear. My stache is growing at the point that I'm realizing I don't have as much invested as I'd like. The real progress has to do with the invested amount, the cash cushion is a side project and is more about sanity than FI. I don't feel I can really include a non-invested emergency fund in my 4% calculations :( , so I'm drawing the line at $20k
(also, I have way more experience in my career now than I did during my last stint of unemployment. That, amazingly, only lasted a few months, so I really don't believe I need a huge emergency fund now, but whatevs)