With any marathon training schedule, I was already in the habit of keeping track of my running. Now I am also keeping track of how many miles i ran on what shoe. Putting everything on google calendar is very convenient as it is also visual as well. I set up a separate calendar for all of my running.
As I’ll be running 5 days a week, many people recommend using two pairs of shoes during training so they both last longer. You are given them two days to dry out instead of just overnight if you only had one pair so some people said you should be able to get more miles out of them. If you run only 4 days a week, it would probably be ok to have one pair of shoes but for 5 or more, its definitely recommended to use two pairs or more.