I somehow made it through the entire 20 minutes!! There were several times when I put my arms down and prepared to stop but somehow kept going until eventually I stopped mentally bargaining with myself with 'just a little further and I can stop' and focused instead on what was for dinner.
Before I knew it Laura was announcing 15 minutes. To my surprise my lungs and legs were still intact and the surprise of it all carried me through the final 5. Many thanks to the folks who voiced their encouragement after my disheartening week 5 run 2. I think it definitely helped!