Punching is great? But what do you mean exactly with 10 min boxing?
Do you work with a sandbag? Do you just do shadowboxing? Freestyle? Correct form?
And please, i don't want to judge you but chris can't simply answer this question? He has no idea about your fitness level, maybe you are completely destroyed after a workout and cant even do the required reps in the last set, maybe it is the other way round and you are really hitting the workout.
it is like very often, listen to your body.
Personally i would say it is ok, because the punches recruit the musclens in a different way. But i would not do 10 minutes after every workout. Do maybe 2 times the week 20 min of a shadowboxing workout and add some footwork like bouncing or moving from side to side. tada, there you have a kind ot toal workout just by some shadowboxing. If you have a sandbag, include it! Your punches will get stronger.
Looking forward to hear from you