3 miles on the bike, is it enough?

I do 3 miles on the bike everytime I go to the gym, is this enough? Or should I do more.

I do alot of other stuff , mainly ab workout, weights, bike, butterfly press...lol


but at first i do 2 miles on bike, everything in between, and lastly one more mile on the bike.

so is 3 enough for cardio?
 
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