If running a marathon is something you really want to do, you'll find the time to fit your training runs in, but it's important to know before you commit just how much time is involved. If your goal is simply to finish a marathon and you're OK with doing some walking, you can probably squeak by with a minimum of four or five hours of training per week, but six or seven hours is more realistic. If you have a specific time goal in mind, your training plan may likely call for running 30, 40 or even 50 miles per week. Now you're easily talking about eight to 10 hours of training every week, and that's just running time. Add in the time it takes to suit up and get out the door before your run, time spent cooling down, stretching, taking ice baths, sports massages or foam rolling, and you can tack on several more hours per week.