You can do cardio as much as you want. It really depends on what you're doing, what your goals are, etc. If you're trying to build muscle mass, then going for a 9 mile run every day is not for you. If you're trying to tone, then a 9 miler may not be so bad.
WAAAAY back in the day, I ran cross country and track in college. Since we had an indoor season, it was a year round sport for me. I went through my logs about 6 months ago and saw that between May (end of track) and the end of November (the end of XC), I took off a total of 3 days and averaged 68 miles per week. I would have only missed 1 day and averaged closer to 77 miles if I hadn't tapered for the end of the season. I say this to prove my point - do as much cardio as you think is good for you. Just listen to your body.
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