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Glam Monitor

What should be your longest run before a marathon?

Author

Rachel Davis

Updated on May 28, 2026

Running coach John Honerkamp recommends capping long runs at 3.5 hours. “A 20-mile run is more mental than physical,” he says. “In most cases, there is no benefit to running more than 20 miles before race day, and there can be significant risks of overuse issues or injury.”

When should my longest run be before a marathon?

The vast majority of plans recommend running no more than 20 miles in your longest run, and usually suggest doing so 3-4 weeks before race day.

How many long runs should I do before a marathon?

Frequency: Most coaches suggest three to six long runs of 16 miles or more in the three months leading up to the marathon. Pace: Run at a comfortable, conversational pace.

Should I run 26 miles before marathon?

While you can run up to or even over 13 miles in half marathon training, you do not want to run up to or over 26 miles in marathon training, especially if you are training for your first marathon.

Is 8 miles a long run?

Many people develop a daily running habit, and while a daily 8 mile run may be excessive, it's a great distance to cover. You are, effectively, a “run streaker,” as you're running every day. You may also be following the same route every day and running at the same time of the day.

34 related questions found

Do marathoners ever walk?

Overview. The good news is that no race disqualifies participants for walking at some point. It is not uncommon for participants in longer races to take a short walking break. And shorter races often draw people of many different fitness levels so walking is not unusual in those events either.

When should I run 20 miles before a marathon?

Most marathon training plans call for a 20-mile run four weeks before the race.

How do I prepare for a 20 mile run?

Get up at least two hours before the start of the race. Eat a high carbohydrate snack of approximately 300 calories. You may need more or less depending on your metabolism and you should have checked this out on your long training runs. Drink at least one water bottle (750 ml).

How do I run a marathon in 5 hours?

A 5:00 hour marathon is approximately 11:30 per mile though a target pace training of 11:00 per mile (4:48) could be beneficial. To break five hours, you should eventually be capable of a sub-2:15 half marathon (10:15 per mile) and sub-60:00 10K (9:30 per mile).

Can I run a marathon if I can run 10 miles?

If you've only run three times a week with your longest run being 10 miles, could you finish a marathon? Yes, most humans have the physical ability to actually run 26.2 miles.

Is 20 miles long enough for marathon training?

The longer you run beyond 20 miles, the higher the risk for developing injuries, burning out and peaking too soon. Plus, running up to the 20-mile distance is enough to build the endurance to get through the marathon, but not too much to risk fatigue, exhaustion and inadequate recovery.

Is 18 miles long enough for marathon training?

Fitzgerald says doing a shorter long run, such as 16 to 18 miles, can still be great preparation for a marathon. For example, he says to complete the last 3 to 8 miles of a long run at goal marathon pace, or run every other mile at goal marathon pace during the second half of the run.

What is the slowest you can run a marathon?

It would be difficult for many, but still possible. 15 minute pace is a brisk walk even for physically fit individuals. Any faster than this would likely require a little bit of running. Therefore, 6:33:00 is the slowest someone can "run" a marathon.

Is 6 hours good for a marathon?

Across the board, most people finish a marathon in 4 to 5 hours, with an average mile time of 9 to 11.5 minutes. A finishing time that's under 4 hours is a real accomplishment for everyone other than elite runners, who can finish in around 2 hours.

Can you walk a marathon in 6 hours?

How Long Does It Take To Walk a Marathon? Walking a marathon will take you anything between 6 and 9 hours, depending on your pace. Brisk walkers who march the course can expect to finish in 6-7 hours. Walking at a regular pace will take around 8 hours.

What does running 20 miles do to your body?

At about 20 miles, levels of glucose in the bloodstream start to drop and the stores of carbohydrate energy in the body are almost depleted. Runners will become more aware of the distress signals that the various parts of the body are sending to the brain.

How long should a 10 mile run take?

"But for the average runner, it's more like a short half marathon." This dichotomy is due to the different amount of time each takes to race 10 miles: 45 to 50 minutes for national-class runners, but over an hour for the rest of the pack.

Should you run a full marathon in training?

"[If] you do it a few weeks before the race, [then you] know your body can take the distance," he says, adding that running the full distance in training helps him recover much more quickly after the race itself.

Is 40 miles a week enough for marathon training?

But for most first-time marathoners, weekly mileage should approximate 30-40. If you've gradually built up to 30 or 40 miles per week from 15-20, this will have a huge impact on your fitness.

How long should my long runs be?

The general rule of thumb is that your long run should be one and a half to two times as long as your normal-length run. For example, if you typically go out for 30 minutes on your easy run day, your long run should be 45 to 60 minutes long.

How long does it take to recover from a 20 mile run?

It's important to know that the body requires a range of 3-5 weeks to fully recover from a training run of 20 miles. The key is to do your 2-3 hour runs in the proper training phase of the Lydiard Method, which usually is in the aerobic base building phase.

Do you have to run the whole time in a 5K?

It's a common assumption among new runners that they need to run at least 3.1 miles in training before the real race in order to ensure they can finish the race. However, you don't have to have run the full 5K distance ahead of time to be adequately trained and “in shape” to complete the distance on race day.

Do marathon runners take bathroom breaks?

Yes, marathon runners can and do stop to pee when they are running and there are many portapotties surrounding the route of the marathon. Those who don't mind about their finish time will be more open to detouring from their running route to find a portapotty and waiting in a queue if necessary.

Do ultra marathoners take breaks?

A lot of ultra-marathons take place over mountainous and technical terrain, at times forcing runners to slow to a walk in order to safely move forward. Alternatively, ultra-runners tend to take frequent walk breaks anyway, due to sheer exhaustion.