How Much Race Pace Training Runners Need Before a Half Marathon or Marathon

Race-pace work is a dose, not a default

A goal time only becomes useful when you can judge whether its pace is sustainable. That means practicing it during training, but not turning every run into a race rehearsal. Too little race-pace work can leave you unprepared; too much can bring on fatigue, injury, or burnout. The point is to find the right dose. Laura Norris, an RRCA-certified running coach with a master’s degree in applied exercise science, says running at race pace helps both body and mind. It can improve durability, helping you hold the pace without a sharp rise in heart rate or effort. James McKirdy, founder and head coach of McKirdy Trained, says how much practice you need depends partly on your target time.

Use time at pace to judge the workout

Norris and other coaches recommend measuring race-pace work in minutes rather than miles. A mile takes different amounts of time for different runners, so distance alone doesn’t tell you how long the body spent at that intensity. Consider a three-mile tempo: it may give a 2:10 half-marathoner enough time at pace, but it could be too brief for someone targeting 1:30. The same issue works in reverse. Six miles might take a 2:15 half-marathoner about an hour—potentially too much—while a runner targeting 1:20 to 1:35 could cover it in 30 to 45 minutes. Norris says the peak race-pace workout should come about three weeks before race day. For a half marathon, she recommends at least 30 minutes at goal pace, with 60 minutes as the upper limit. Longer efforts may appear in some plans, but she cautions that more than an hour at half-marathon pace demands substantial recovery. It also means more mechanical stress on the body, particularly if fatigue starts to undermine form. For marathon training, her suggested peak workout includes at least 45 minutes at race pace, capped at roughly 80 to 90 minutes to leave time to recover. Those efforts can help the body use carbohydrates efficiently, clear lactate as intensity rises, and improve running economy through changes in the muscles and neural pathways. There’s a practical check built into the workout, too. Norris says holding the pace long enough makes it harder to convince yourself a goal is realistic when it isn’t. If you’re three weeks from race day and the pace leaves you gasping or unable to speak, it may be too fast. McKirdy sets a higher benchmark: aim to spend about half your goal finishing time at race pace. For a two-hour half marathon, that means being able to hold the pace for at least an hour in training. The tradeoff is straightforward: more time at pace means more recovery afterward.

Build the work as race day approaches

First-time half-marathon and marathon runners may not need as much race-pace practice as experienced runners with a time goal, McKirdy says. Their training has another job: getting them ready to finish a distance that’s new to them. For returning racers, Norris suggests adding race-pace work to one run every other week when the event is eight to 12 weeks away. Using a range of paces early in the plan can raise aerobic fitness and leave more room to improve at half-marathon or marathon pace; changing the workouts can also keep training from feeling repetitive. In the final six to eight weeks, she recommends race-pace work once a week. You’ll need to build up to the peak effort. Norris suggests starting with shorter intervals, such as 4 x 5 minutes with a 60-second recovery jog, then progressing to 5 x 6 minutes, 3 x 10 minutes, and eventually 30 minutes continuously at pace. McKirdy says a weekly or every-other-week “touch” at race pace helps runners get familiar with it and check their expectations. His example is blunt: if you’re aiming to finish a marathon in four hours but can’t run an hour and 45 minutes at goal pace near the end of training, you may have a problem.

Set a goal pace you can revise

A goal race pace is a starting point, not a promise. Training feedback may show it’s too ambitious—or that you’re capable of more. One option is to take a 5K, 10K, or half-marathon result from the past six months and enter it into a race pace calculator. Norris warns that calculator predictions often run too fast. She recommends adding three to seven minutes to the projected finishing time before using it as a baseline. If you have experience judging effort, Norris suggests trying a 15- to 20-minute tempo early in the season at half-marathon effort. Don’t check your watch. You should be able to speak in phrases of four to six words; use the pace you end up running as a starting estimate. Norris advises focusing on effort rather than pace in the early weeks, then checking whether the target still feels manageable as workouts grow longer. McKirdy offers one sign that a pace might be too easy for someone seeking their best performance: finishing with enough breath to sing a song. The harder question is whether you’re pushing too much. At marathon pace, Norris says, you should still be able to speak in full sentences, even if talking isn’t appealing. If you can’t, slow by five to 10 seconds per mile. At half-marathon pace, aim to manage a longer phrase of about four to six words; the effort sits close to threshold pace. If speaking feels too difficult, ease off by five to 10 seconds per mile, then adjust again if your breathing remains strained.

Workouts that make the pace concrete

Two-mile repeats are a common choice for half-marathon preparation, according to Norris and McKirdy. They fit into a midweek session or a long run. Start with 2 x 2 miles at half-marathon pace, then progress to 3 x 2 miles; more advanced runners can try 4 x 2 miles. The suggested 30-minute minimum falls between the two- and three-repeat versions. Repeats give you a chance to practise pacing, and the recovery between efforts can make the workout feel more manageable, Norris says. McKirdy uses them around five to six weeks before race day to assess how training is going. The session won’t answer every question, but if you’re finishing two or three rounds with a couple of minutes’ rest and collapsing onto your hands and knees, it’s a reason to reconsider your goal pace. For marathon preparation, Norris suggests running six to eight miles at marathon pace within a 14- to 16-mile long run. That can provide the recommended 45 minutes at pace for runners whose target pace is between eight and 11 minutes per mile. The session also tests how you tolerate both the pace and your fueling—provided you practise fueling during the run. Heather Mayer Irvine is a contributing writer and former food and nutrition editor for Runner’s World. She wrote The Runner’s World Vegetarian Cookbook and has run nine marathons, with a personal best of 3:23. Her bests include a 19:40 5K and a 5:33 mile, and she is an RRCA-certified running coach.