I think it's great that you have such ambitious goals! Even if you don't quite make the thirty, who could be disappointed about being down twenty or twenty-five in that short of time? And if you're following the Jenny nutritional guidelines and getting in enough calories, and your body's metabolism allows you to lose at the higher rate, great for you! I know that Robin41 and RockinRobin both lost at rates fairly close to that for much of their weight loss. (I haven't achieved anything near that, though, and I feel really good about my accomplishment of 72 pounds in 10 months!)
I, too, am training for a half-marathon. I also considered (very briefly) training for a full marathon, and as Chamie noted, there is quite a bit of difference between the two. I looked up suggested training schedules for each, and the marathon training is significantly more difficult. However, I think Robin's idea of going to the Cool Runnings thread in the Exercise thread is also a great idea. Those women know their stuff, and I have gotten some great responses about my training. Information about nutrional needs might be very useful.
Good luck with both of your very ambitious goals, Chamie.
October challenge - 10/02/2015 - 11/01/2015
Wedding challenge - 06/09/2015 - 08/09/2015 - Not successful. =(
Biggest Loser Challenge (12/29 - 03/16) - Not successful. =(
Trainer boy challenge #3 (11/11-12/11):
Not successful. =(
(Trainer boy challenge #1 completed 09/11 - down 23.2 pounds - starting weight 239.8) (Trainer boy challenge #2 completed 11/11 - down 23.4 pounds - starting weight 216.6)