Look, 10.33 and I'm still up, that's why getting up early is out of the question. If I remember, I used to get up at 7.30, bowl of cornflakes, run 5 miles to school, shower and start teaching by 8.45 - I had a bit of a charmed life cos the headmaster was a runner and supported my running career, so I got away with murder. I taught at the Archbishops School in Canterbury, a non-selective church school but as I ran for the Archbishops charity when I won LM I was forgiven not preparing my lessons. Thank goodness we didn't have Ofsted then.
I think with FLM, you need to give up what you want to do and do what you should do, and that is a half no closer than 4 weeks before and maybe a 10k 2 weeks before.
I have just launched a 10km to be at Longleat on Feb 6th - now I would be surprised if that didn't figure in your planning!