From my side, in full raging against the dying of the light mode, I'm plugging away with the aim of Boston on Apr 20th. I can't manage repeated training over distance, so it's very conservative. The running started in January at 5 mile distance twice a week and the aim is to steadily increase the weekend distance but not the frequency of running.
ATM, the week is
Monday - Gym (Strength)
Tuesday - Gym (Elliptical trainer)
Wednesday - Gym (Strength)
Thursday - 7 miles at 8 to 8:10 pace per mile
Friday - Gym (Strength)
Saturday - Off
Sunday - "Long" Run at 8-min pace
At this stage the long run is up to 17 miles, completed with timeout on Sunday. The problem is that because there's no running during the week, there's no fitness, leading to a right old dose of DOMS yesterday and today. Ideally I'd get 3 X 20-miles done before the first week of April, then recover a bit coming into marathon day. It all depends on the knee (meniscus / osteo, same as jimmy) not giving up in the interim. I'm just delighted to be out running and hoping the years of high mileage don't do for me. LOL, some craic looking to do a marathon on 2 runs per week.