It may have helped to shorten them... I'm not sure.

I didn't make it through a single run interval without taking a walk breather after about mile 7 again. My time was terrible, 3:08. I'm proud of myself for making it through, but the run just had a lot of issues.
It was really cold and snowing today (about 32F and sideway blowing snow from about 10 miles on). I also made some poor map routing decisions that had me hit about a half mile of unmaintained (i.e. unplowed) "road" at about 1.25 miles in which really sapped a lot of energy and I lost my groove just after I'd started to get into one. I had to walk and just concentrate on not falling over because the snow was about ankle to shin deep, and since it's been raining and melting, the snow pack was not solid at all, I kept sinking and falling through. Then I had a pretty significant hill between mile 7-8 that I walked up most of it, and another REALLY significant hill at 11 that I also walked up. I don't know why I thought it was a good idea to create my route coming at the wrong end of a road called Pudding Hill Road at mile 11? I was having some sort of amnesia I think about the length/steepness of the hill. We don't drive up it often and I was thinking, oh it won't be that bad... I'll walk up it but it's not that long... but it is like a quarter mile and steep! By that time I'd been out for like 2.5 hours and the snow/wind were really picking up and my legs and butt were so cold that walking up that hill that all my muscles just locked up and it was really hard to move anything again after I got to the top. I think that my IT bands were in agony but my legs were so numb I couldn't feel them, which was probably good.
But I am glad I finished, and I am feeling good about being able to hit my < 3:00 goal in a warmer/flatter environment.