One of my favorite things about BJJ is how long the road to mastery is and how viscerally obvious it is when you aren't a master. It weeds out high time preference people fast.

My best friend has been doing BJJ for years. I used to take kickboxing lessons with him and he moved on to BJJ. He has competed a couple times at tournaments. He loves it. I think he is also a brown belt. He hopes to get to black belt eventually but is only training a couple times a week so it will take some time. 

grayruby

Only 18 months 2-3 days/week. I'd still do it if I could stop myself from obsessing about it to the detriment of other things or if I found it more natural so maybe I wouldn't need to obsess about it. I saw an appreciable difference going from 2 days/week to 3 days/week, so I'd recommend a minimum of 3 days/week.

It's a great sport on a number of levels. Met one my best friends training. He got his brown belt last year.