Are you talking about a choke that closes the carotid or one that crushes the airway? Cause 30 seconds is a *long* time in my experience. 5-10 seconds is what I'd normally say when I've seen it done well.
There's a good article here I just found surfing around on the topic.
Article on choking in judo by an MD.
Nah..your right....I don't really time em...but thinking about it...yeah 30 seconds is a long time. Typing too fast this morning. LOL. I think it might seem like 30 seconds, but 5 is about right!
Thanks for the great post on the subject Keith!