I actually had a very good race. My unambitious aim was 3h06m and finished in 3h09m.
The only problem i had is that I actually relaxed a little too much the first 10km. I started slow and let people overtake me to the point were i had way too much energy right up to km 40.
By km 5 i realised i had been overcautious and was over a minute behind. I did not want to make the extra effort to gain the time back and I was feeling extremely good so I only increased the pace slighly and finished the first half 2 minutes behind schedule in 1h36m.
From then on I pushed on to do 1h33m for the second half.
I'm sure I could have done 3h05m or better but in the end i had a great race feeling strong up until the last 2 km and I have to say that for a chance it was nice not to suffer the whole time.
Maybe next time I'll push a bit more and attempt the sub 3h