I actually found that running 7 days a week was easier than 5 or 6. Since I run in the morning, the alarm goes off at 5:00 and I have about 2 minutes to decide to get out of bed. When I scheduled a day off, I always took it and the day after was always hard to get up. Now, I run every day and didn’t have a decision. There are no excuses.
Also, I though the transition to 7 days a week would be harder. I kept the mileage and intensity the same and just spaced out the work. Actually, my body responded to it very well. I just need to go to bed on time. It was the best thing that I did for my running. Well… that and doubling my weekly mileage.