Yes. 20% of net, all of which goes to the FIRE fund ("retirement" investments). 10% or so per person is the traditional rate. Since this post is in the FIRE section, I assumed that people want to exit before 65.
Our average over the last few years has been well over that, which is why I believe it's not a stretch to go for 20% on most salaries/living situations. If it's not, I'd reevaluate spending on house and/or car.