The useful lesson here is that race pace has to be practiced, but treating every run like a dress rehearsal is a good way to arrive tired or hurt. The challenge is finding enough time at your target speed to prepare your body and judge whether the goal is realistic—without making the workouts so demanding that recovery becomes the next problem.
If you’re targeting a marathon or half marathon, start with a goal time and the race pace it implies. Then build practice into your plan. Across a 16-week training block, that work can help you feel steadier at pace. But the dose matters: too little may leave you unprepared; too much can bring fatigue, injury, or burnout.
“It’s important physiologically and psychologically,” says Laura Norris, an RRCA-certified running coach with a master’s in applied exercise science. Training at race pace can improve your body’s durability, she says, helping you sustain the effort without a sharp rise in heart rate or perceived exertion. James McKirdy, founder and head coach of McKirdy Trained, says the amount you need depends partly on how fast you plan to finish.
How much time at race pace is enough?
The coaches interviewed by Runner’s World measure race-pace work in time, rather than miles. Norris’s reasoning is straightforward: the training stimulus comes from how long you spend at the effort, and the same distance takes different runners different amounts of time.
Consider a three-mile tempo. It may provide enough time at pace for a 2:10 half marathoner, Norris says, but too little for someone aiming at 1:30. A six-mile tempo could create the opposite problem: about an hour of hard running for a 2:15 half marathoner, but roughly 30 to 45 minutes for someone targeting 1:20 to 1:35.
For the half marathon, Norris recommends reaching at least 30 minutes at race pace in the peak workout, usually about three weeks before race day. She advises capping that effort at 60 minutes. Some plans go longer, but the recovery cost is substantial: “It’s not worth the risk of overreaching too much before a race, and 60-plus minutes at half marathon pace requires a lot of recovery,” she says.
Longer efforts also mean more mechanical stress on the body. When fatigue degrades your form, that stress can raise injury risk. For marathon training, Norris’s suggested peak workout is at least 45 minutes at race pace, with an upper limit of about 80 to 90 minutes to leave time to recover.
Those sessions are intended to help the body use carbohydrates efficiently, clear lactate as intensity rises, and improve running economy through muscular and neural adaptation. They’re also a reality check. “This amount of time is helpful in an honest assessment of your race pace. It’s harder to cheat,” Norris tells Runner’s World. If, three weeks out, you can’t hold the pace without getting gassed or struggling to speak, your target may be too fast.
McKirdy sets a higher benchmark: spend about half your goal finishing time at race pace. For a two-hour half marathon, that means holding the pace for at least an hour in training. The tradeoff is predictable: more time at pace demands more recovery.
How often should race pace appear in training?
Most runners can benefit from practicing race pace, but first-time half marathoners and marathoners may have more to gain from simply building the fitness and confidence to finish. McKirdy says their training is already new, and the plan should reflect that.
For runners who have raced the distance before, Norris suggests adding a race-pace workout about every other week when the event is eight to 12 weeks away. Work at varied paces earlier in the cycle can raise your aerobic ceiling and make faster race paces more attainable; the variety can also keep training from feeling repetitive. Once you’re six to eight weeks from race day, she recommends a race-pace session each week.
That weekly work should build gradually. You might begin with 4 x 5 minutes at race pace, with a 60-second recovery jog, then progress to 5 x 6 minutes, 3 x 10 minutes, and eventually 30 continuous minutes. Norris cautions that runners shouldn’t expect to manage the full 30 minutes at the start of the build.
McKirdy says a weekly or every-other-week “touch” of race pace can help runners calibrate expectations. For a four-hour marathon goal, he tells Runner’s World, failing to run an hour and 45 minutes at goal pace near the end of the training segment is a warning sign: “you’re in for some problems.”
Setting a goal pace you can defend
Your target pace is a working estimate. Coaches say it should change when workouts show that it’s too ambitious—or that you have more in you.
One starting point is a recent 5K, 10K, or half marathon result from the past six months. Enter it into a race pace calculator, then treat the prediction cautiously: Norris says these calculators often produce targets that are too aggressive, and recommends adding three to seven minutes to the predicted finishing time.
If you’re experienced at judging effort, Norris offers another option: run a short tempo of 15 to 20 minutes at half marathon effort without checking your watch. You should be able to speak in phrases of four to six words. Use the pace you ran as a starting point for training.
When to change the target
A training plan has to account for fitness, fatigue, daily life, and changing goals. A target that’s too slow can limit performance; one that’s too hard can leave you depleted well before the finish. “These paces are meant to be refined and adjusted as you go through training,” Norris says.
Early in a half marathon or marathon plan, she recommends running by effort rather than chasing a precise pace. As workouts get longer, you can use that feedback to settle on a pace you can sustain.
McKirdy’s test for a target that’s too easy is blunt: if you’re aiming for maximum performance and finish “singing a song,” you aren’t working hard enough. But there’s a line between hard and unsustainable. At marathon pace, Norris says, you should still be able to speak in full sentences, even if you’d rather not. If you can’t, try slowing by five to 10 seconds per mile.
Half marathon pace should feel harder. Norris says you should be able to manage a longer phrase of about four to six words; you’re close to threshold pace. If talking is too difficult, ease off by five to 10 seconds per mile. If breathing still feels too labored, slow by another five to 10 seconds.
Workouts that put the pace to the test
For half marathon preparation, Norris and McKirdy often use two-mile repeats, either midweek or within a weekend long run. Start with 2 x 2 miles at half marathon pace, then build to 3 x 2 miles; more advanced runners might progress to 4 x 2 miles. The 30-minute minimum at race pace will typically fall between the two and three-repeat versions.
“Knowing how to pace over two miles and repeating it is a really good workout,” Norris says. She also sees a psychological benefit: the recovery between repeats makes the work easier to manage mentally.
McKirdy uses the session as a fitness check about five to six weeks before race day. It won’t tell him everything, he says, but it can show what an athlete needs. If someone finishes two or three repeats with a couple of minutes’ rest and ends up on their hands and knees, the goal pace deserves another look.
For marathon pace, Norris recommends running six to eight miles at goal pace within a 14-to-16-mile long run. That reaches the 45-minute minimum when the pace falls between eight and 11 minutes per mile. The workout also tests whether your pace and fueling plan work together—provided you practice taking in fuel during the run.
Heather Mayer Irvine
Contributing Writer
Heather is the former food and nutrition editor for Runner’s World, the author of The Runner’s World Vegetarian Cookbook, and a nine-time marathoner with a best of 3:23. She’s also proud of her 19:40 5K and 5:33 mile. Heather is an RRCA certified run coach.
