The longer term goal is to get the students to be able to go for 3 minute intervals at full or near full speed. About a year ago I got to spar with a young (I think he was about 27-28) but certified pro boxer and 5 3-minute rounds with him was a looooong freaking time. So, I have set that as my ideal interval time in my own cardio training and am working the students up to that. I don't anticipate ever getting anybody into a MMA/NHB event where they are looking at 6-9 minutes straight so if they can work up to 3 minutes at full intensity then the 1-2 minute rounds in local comps should be nothing to them.
Our sparring is basically done in 3 minute rounds as well.
I totally agree that it is up to the student to strength/cardio train but I think the hobbyist is wanting it all in the same package. So, in my class they will eventually hit a point where they are getting 20 minutes of good straight cardio and 20 minutes of stretching and 80 minutes of 'kung fu'.
"George never did wake up. And, even all that talking didn't make death any easier...at least not for us. Maybe, in the end, all you can really hope for is that your last thought is a nice one...even if it's just about the taste of a nice cold beer."
"If you find the right balance between desperation and fear you can make people believe anything"
"Is enlightenment even possible? Or, did I drive by it like a missed exit?"
It's simpler than you think.
I could be completely wrong"