Jim's message is right on the mark, so I won't add to that.<br><br>
While not as focussed as marathon training, HM training done right will occupy a significant portion of your week for a large number of weeks. What you have to do is assess your current fitness and goals, and set up a training plan that works for your ability, goals and lifestyle, including family commitments, job & other interests.<br><br>
When evaluating your training plan, think about the distance you intend to run and what counts most when training for that distance. For HM's I place top priority on long runs, and second from the top is a run with a good chunk (20 to 45 min) at threshold pace. Other than those two, my remaining runs will be just simple easy paced runs with a bit of fartlek or some striders thrown in for muscle memory.<br><br>
You should be looking at a couple of runs on say Tuesday and Thursday that are in the range of an hour to 90 min, depending on where you are in your training. One of these could include 20 to 45 min at your threshold pace, again, depending on where you are in your schedule....longer periods at threshold as you get closer to race day. Saturday can be easy and short, and Sunday can be long....up to two hours or even a bit longer if you feel good. A key point here....after every run you should assess how you feel. Could you go another mile without hurting? That's good. You should not feel like you were at the end of your energy on any run. You don't want to run yourself into a state where you won't be ready for your next quality run.<br><br>
It may take a couple of races before you get your schedule right, but that's part of the fun in running and racing. Once you get that part down you can consider whether you want to step up to more than 4 days.<br><br>
Do not step into the cognitive bear trap, where you believe you are too old or too slow to run more days. I'm 57, and I believe everyone can run 7 days per week if they really want to. It's just a matter of determining how long to run on your quality days and how short to run on your recovery days. Even a 20 min run has value, and anyone could add that to the in between days of a 4 dpw schedule without affecting their fatigue level.<br><br>
One last piece of advice....you should look for a couple of shorter races in the final 8 weeks of your training. Don't do anything special. Just run them as well as you can to see how you do, and use them to help decide what pace to run your HM.