How Long Should Half Marathon Long Runs Be?

By Haleigh Hockenberry · Thu, Jul 2, 2026, 2:09 PM

One of the most common questions in half marathon training is: how long should half marathon long runs be? The answer depends on your experience level, training background, and race goals, but in general, long runs are the foundation of half marathon success.

Long runs build endurance, improve aerobic fitness, and prepare your body and mind for sustained effort over 13.1 miles. While speed workouts and tempo runs improve performance, long runs are what allow you to finish strong.

If you're building toward your first race, pairing your long runs with a structured plan that includes Easy Runs and gradual progression is essential for staying healthy and consistent.

What Is the Purpose of a Long Run?

Long runs are not about speed, they are about time on your feet. They help your body adapt to longer distances by improving:

• Aerobic endurance
• Fatigue resistance
• Mental toughness
• Energy utilization
• Muscular durability

These adaptations are what make it possible to hold a steady pace in the final miles of a half marathon.

Ideal Half Marathon Long Run Distances

For most runners, the longest training run before a half marathon falls between 8 and 12 miles. However, the exact distance depends on your experience level.

Beginner Runners (First Half Marathon)

• Long run range: 5–10 miles
• Peak long run: 9–10 miles

Beginners do not need to run the full 13.1 miles in training. The goal is to build endurance gradually while staying injury-free.

Intermediate Runners

• Long run range: 7–12 miles
• Peak long run: 10–12 miles

At this level, runners may include portions of their long run at race pace to simulate race conditions.

Advanced Runners

• Long run range: 10–14 miles
• Peak long run: 12–14 miles

Experienced runners may extend long runs slightly beyond race distance in training cycles, but this is not required for everyone.

How Fast Should Long Runs Be?

Long runs should feel comfortable and controlled. Most runners should run them significantly slower than half marathon pace.

Think of your long run effort as:

• Easy conversation pace
• Controlled breathing
• Low to moderate effort

Running too fast is one of the most common mistakes in half marathon training and can lead to burnout or injury.

Should You Run 13 Miles in Training?

Many runners assume they need to run the full half marathon distance before race day. In reality, this is unnecessary for most training plans.

Running 13 miles in training can:

• Increase injury risk
• Require excessive recovery
• Reduce training consistency

Instead, a well-structured plan builds up to a peak long run of 10–12 miles, which is enough to prepare your body for race day.

When Should You Do Your Long Runs?

Most half marathon training plans include one long run per week, typically on the weekend. This allows enough recovery time before and after the run.

Long runs should be paired with:

• Easy Runs during the week
• One Tempo Run session
• Rest or recovery days

For a full breakdown of training structure, see our Tempo Run Guide and Easy Run Guide.

Fueling Your Long Runs

Once your long runs exceed 75–90 minutes, fueling becomes important. Practicing nutrition during long runs prepares you for race day success.

Focus on:

• Hydration
• Carbohydrates (gels or sports drinks)
• Electrolytes when needed

Recovering After Long Runs

Recovery is just as important as the long run itself. After completing a long run, prioritize:

• Refueling within 30–60 minutes
• Hydration
• Light movement or walking
• Rest or easy running the next day

Proper recovery helps your body adapt and get stronger over time. Runner's World's guide to recovering after long runs emphasizes that refueling, rehydrating, and allowing adequate recovery time help repair muscle tissue and prepare your body for future training sessions.

Final Thoughts

So, how long should half marathon long runs be? For most runners, the sweet spot is 8–12 miles, depending on experience and goals. The key is consistency, gradual progression, and running at the right effort level, not maximum distance. Runner's World's guide to minimum half marathon long-run mileage explains that many runners can successfully complete a half marathon without running the full race distance in training, provided they build endurance through consistent weekly mileage and appropriately structured long runs.

When combined with Easy Runs, Tempo Runs, and proper fueling, long runs become the most important building block of your half marathon success. Marathon Handbook's guide to determining your longest half marathon training run also highlights that the ideal long-run distance depends on your experience, training history, and race goals, with gradual progression playing a larger role than simply covering the maximum mileage before race day.