Interval Junkie --Nobby
This might give you a good hint at what you might achieve: http://www.mcmillanrunning.com/index.php/site/calculator
Looks like about 4 and a half hours might be a good goal for your first one.
2014 Goals: sub-3 Marathon
Current Status 08/28: Slowly working back up from a pelvic stress fracture. 4mil distance PR w00t!
Yes I think Im going to start at that pace, it I feel VERY confident at 20 I might up it.