I'm not so concerned about the duathlon/century issue--they are almost 3 months apart, so I will have plenty of time to build my mileage up for that long ride. My biggest quandry is running and cycling. Even the "faster" du program (from Training Plans for Multisport Athletes) I have found assumes that the athlete is not running much more than 2 hours/week. I have a 25k race 2 weeks after the du...2 hours wouldn't even cover my long run training for that, much less supporting runs.

What I think I will end up doing is all of the cycling workouts in the du plan pretty much to the letter, then extend the running workouts. I can't see running even the 2 5k legs of the du well on the meager mileage the plan I'm looking at suggests. I will still be cutting my overall running mileage back from what I typically do, but I'll take the weekly rest days that the plan requires. Better to be a little undertrained at this point than overtrained--that's never a pleasant thing.

This year I will see how it goes and maybe not do the 25k next year. It's not even my favorite race (it's the biggest one in the US, so it's popular locally, but I've done it twice, so it's lost a bit of the intrigue) -- a friend is doing it for the first time and I am going to keep her company, more than anything.