Dude, the OP is probably at an 11 minute mile pace now. WHY ARE YOU NOT SHERDOGGIN YA MOBILE?
^ So you got cold. I ran through mine. Just meant I came home smothered in mucous from misfired snot-rockets. Get running you big girl's blouse.
If you train and run smart, you can actually run 6 days a week. Their is a science to doing that. The first key is that not every run is the same, nor is it the same distance. Sunday I run 30 min at about 10:00 mile pace. Nice and easy. Monday is usually a hard run at 6:30 pace for 3-4 miles. Tuseday is intervals at 1K 2:30 or 2:40 pace and I do 6 of those. Wednesday is 5k at slower than my actual race pace for a 5k. Thursday is 3-4 miles at just slower than monday pace. Friday is usually a pre-meet type workout, get everything lose and ready for saturday, but if there is no race, it is usually 3 easy miles. Then Saturday is a rest day, and it starts all over. Also on saturday is when i get a bike or swim in as to not be stationary.
No it takes a prolonged period, like a couple weeks of no exercise and bad diet before you would notice anything and even still it's not drastic, just a gradual decline towards a cardio level in line with what your current physical condition will end up being without constantly exercising at that level.
Personally, running every day isn't good, it's hard on your knee's and you aren't giving your cardio vascular system or your musculoskeletal structure time to recover. At least have one day in between runs. You are better going slow for long distances, are really short intervals it high paces repeatedly. Train smart when it comes to running, very important!
If you train and run smart, you can actually run 6 days a week. Their is a science to doing that. The first key is that not every run is the same, nor is it the same distance. Sunday I run 30 min at about 10:00 mile pace. Nice and easy. Monday is usually a hard run at 6:30 pace for 3-4 miles. Tuseday is intervals at 1K 2:30 or 2:40 pace and I do 6 of those. Wednesday is 5k at slower than my actual race pace for a 5k. Thursday is 3-4 miles at just slower than monday pace. Friday is usually a pre-meet type workout, get everything lose and ready for saturday, but if there is no race, it is usually 3 easy miles. Then Saturday is a rest day, and it starts all over. Also on saturday is when i get a bike or swim in as to not be stationary.