What I had planned was the following:

0–20K: Not even notice that I was running until 20K (helped by the night, feeling a bit sleepy)
20–40K: Start warming up and wonder at the sunrise
40–50K: Rejoice about the fact that I would soon be crossing 50K, knowing that in a long-distance race like that the interesting part only really begins after that point
50–70K: Hold on and feel like under a strong anaesthetic, helped by a podcast to get lost in my thoughts
70–100K: Lie to myself 3 times by telling me that I would only have to run 10K each time. 10K is short, right?