Long 1:29:47  17.68 km (5:05 / km)
The plan was to run 2 hours on the treadmill (as an extension of yesterday long run), first hour at 5:10 pace, second at 4:40.
Well, the main problem appeared to be a mental one. I read your article about treadmill running and you know how boring it is no run at same speed hour after hour. Interval training on a TM is okay, I actually like it, but this is hell.
The first hour was really long. But then the next one started, I increased pace to 4:40 and could stand only 10 minutes. The heart rate wasn't really high, I knew I could run an hour and more at pace like that outdoors (is there were no snow) or even on an indoor track, but doing that on a TM killed me. I slowed down back to 5:10 and after 8 minutes went back to 4:40 but could make myself run only till 1,5 hours passed, after that I decided to stop.
Bad thing - I couldn't run for the entire 2 hours. Good thing - 1,5 hours on a TM is probably my new lifetime record :)
Besides my legs were a little bit tired after yesterday run and after strength workout I did a day defore (mostly on legs). And it's really hard to breathe when running on a TM - it's hot, no fans and you start to sweat heavily.