The answer to this will depend on how your body and mind react to 5-6 days cardio.
Personally, I cannot do it. When I do cardio, 3 times per week, I go all out, a combo of steady state that is increasingly demanding during the session with intervals thrown in. When I am done on those days, that is it. I am completely done. As a result, I am not interested in doing cardio 5 days per week, my mind does not care for it, the idea bores me and I cannot motivate myself to do it. So, I have rest days from cardio. As a result of this, when it is cardio day again, I am raring to go and have my full quotient of energy and mental toughness at the ready.
As the previous poster said, keep the cardio you do on your weight days to a much lower intensity and do only 20 minutes, so that it functions more as a warm up for the weight training than anything else. Otherwise, I fear you may burn out before you reach the level of fitness you desire. The short cardios on Cathe's CTX are perfect for this.
Clare