Personally, I wouldn't run twice a day. You need to give your body time to rest and heal after a run. There are great programs online to tell you how to time your runs and it sounds like you are already using the C25K program. Don't overwork your body because that will cause you to be more prone to injury.
Also, I don't run in consecutive days. This is my usual schedule (sometimes varies)
Monday - Elliptical (45 min)
Tuesday - Run (3 miles)& Strength Training
Wednesday - Elliptical (45 min)
Thursday - Run (3 miles) & Strength Training
Friday - Rest or Elliptical (usually rest)
Saturday - Long Run (4 to5 miles)
Sunday - Rest or Stretch
Just my 2 cents.
Take Care!
__________________
Judy 
297/ 144/150
Highest/Current/Goal
Lap RNY & Gallbladder Surgery 7-7-08
Achieved Goal of 150 on 9/12/09 
TT Road Runner #1
Last edited by mermiesmom; 06-25-2009 at 07:19 AM..
Reason: added more info
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