Well, it is definitely getting harder. This was the first run in the entire series that I actually was not able to run the entire way. It was a 25 minute run and I had to stop at the 23 and a half minute mark. I am still happy with how I did (I ran about 2.25 miles during that time) and will continue to train. Also, it didn't help that I did not use my inhaler before this run, like I typically do.
This just showed me how hard I've been working. It would have been inconceivable to run 20 minutes straight 6 weeks ago, so missing it by a little this week was not that big of a deal. Next week, I increase and am supposed to run straight for 27 minutes. I'll remember to use my inhaler and I should hopefully do well.