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It really depends on what you are looking to gain.
For example, a 3 mile run works your heart harder than a 3 mile walk, but the walk will work your heart for a longer period of time.
Are you training for sparring rounds, for cardio-vascular health, to lose weight?
The answer to your question depends entirely on what you want to gain.
Depends what you are training. You have aerobic and anaerobic energy systems and each one require conditioning. Lets say if you want to affect both do 800m run at high intensity. Is running your only conditioning exercise?