Sudden increases offer a route to injury. You might say that these midweek workouts are like a sandwich. Two relatively easy days on the outside with a relatively harder day on the inside. Don't stay out too late tonight. You still want to catch up on any sleep you might have lost during the hard weeks of training and, especially, before the marathon, when nervousness might have prevented you from sleeping deeply.
Sleep loss is cumulative, and it's time to catch up.
The top optional end of today's training is an hour of running, as was the case last Saturday and will be the case next Saturday. The difference is the bottom optional end. I want you to do at least 45 minutes of running compared to a minimum of 30 last week. Slight increases in difficulty result in the most gain. Keeping with the spirit of this second tapering week, whatever you do today should not be done with high intensity.