Cardio Limit?

[letsrockbaby]

I have nothing going on within the next few weeks, so I figured I might as well hit the gym a few more days than usual. I usually lift M/W/F and do cardio Tu/Th/Sat, but figured it wouldn't hurt too much to do a bit more cardio since my lifts can't go up significantly due to an injury.

My cardio sessions are usually half an hour. Will I overexert/piss off my body if I... a. ... lift in the morning and then do cardio in the evening about 5-6 hours later? b. ... do cardio 4-6 days a week? I hate calorie counting, but I eat around ~1700/day.

Thanks in advance!

[petitpowerhouse]

It can't hurt, 30mins of cardio is pretty small, so adding more could help.