wow, i was all anxious to reply then i see your second post. seeing as how i was out with my girlfriend and not sitting in front of my laptop waiting for you to post all day im not sure if i want to help you. seriously. bad forum etiquette there. but whatever, ill cut you a break with those 2 total posts you have.
when you say low for your cholesterol, how low? what was the total? and what was your triglyceride count?
as for cardio, no need to do it on separate days unless you like some active recovery for the legs. if you have a sled do some sled work. if you have some KBs do some swings on lower body days, and turkish getups on upper body day.
you should be getting a cardio effect on the DE days. i would say at least the lower body DE day. for one cycle i will do as many as 20 sets of 2 in as little as 12 minutes. that will get your heart racing.
you could also superset your accessory work. like abz and your weak link exercises.
and you could also do something on your off days as you see fit. in this case i do not believe i can offer a best time without more information.