I've wondered that about myself, Tony. Mind you, my limit on time spent talking about MA is identified by Maria saying, "Enough Aikido, already!"I'm definitely a martial arts nerd myself. I train 10-12 hours per week on average (a bit more when I'm rested and inspired) and probably spend another 10-12 hours per week reading about, talking about, thinking about, or watching martial arts. But after that point my brain starts needing some time off to recharge.
I'm curious about whether this is my actual upper limit or if I could happily spend a bunch more time on it if I didn't have to work for a living. Maybe when I retire I'll just end up spending all day in the dojo.