I did W6R2 last night. The first 5 minutes were hard. It was hot outside again, and very humid which was not ideal. After the first 5 minutes though, I settled down into a nice pace and the rest was fine. The second 10 minutes was actually easier than the first, and I stepped up my speed when Laura told me there was only 1 minute to go.
I have now realised though that it's just long runs from here on in....... scary! I hope my legs recover more easily after the 25 minute run that's up next, than they did after my first 20 minute run last week.