Frequency and Speed
Here are two thoughts:
Frequency:
You only have to run two to three times a week. That frequency never has to change. I think there is a myth that you have to be running every day to complete a long run like that. The opposite is true. Your body needs rest and needs days where you have no exercise.
So in the beginning, you’re only talking about finding two hours a week. By March, it will probably be about four to five hours. That’s it.
Speed:
Time does not matter.
It doesn’t matter if you are running 7 minute miles or 15 minute miles. Speed comes with time.
Your goal is to stay alive and finish.