Posted: 18/01/2015 at 13:20
JJ, I think you'll be comfortably inside the 5 hour mark if you don't start too fast. We do a time trial in a couple of weeks, or use the half marathon to get clearer on pacing strategy.
Keep running the easy runs easy....
Also, can you wear the HRM for your 2nd easy run this week? It would be good to get some comparison data.