"How long should my long run be?" is one of the most-asked questions in distance running. The honest answer is that the science is messier than the running magazine version. Sunday long runs of 90 minutes, 2 hours, 25% of weekly mileage, 1.5x race distance, all have advocates and all have research behind them. This is the actual evidence-based answer.
Long runs drive three adaptations that shorter runs do not produce as efficiently:
The threshold duration for these adaptations starts around 90 minutes for trained runners and 60-75 minutes for newer runners. Below that, you are doing a moderate-distance run; above it, you are accumulating the long-run-specific stimulus.
Most coaching frameworks land in a similar range:
For a 60 km/week runner: 15-20 km long runs. For 40 km/week: 10-13 km. The percentage limits exist because long-run stress disproportionately taxes recovery, too long relative to weekly volume produces more injury than adaptation.
For race-specific training:
For marathons specifically, the recent shift has been away from "you must run 32+ km in training" toward "running 28-30 km is sufficient at the right intensity and frequency."
Most modern coaching defines long runs in time, not kilometres. The reason: a 22 km run at 4:30/km (~100 min) and a 22 km run at 6:00/km (~132 min) are very different training stimuli. The slower run produces more total fatigue and bigger aerobic adaptations; the faster run is closer to threshold work.
Typical long run time prescription:
The long run is not the place to push pace. Standard prescription:
Most long runs should be easy. Threshold and progression variants are inserted strategically in race-specific phases, not weekly.
A 2-hour easy long run takes 24-48 hours of full recovery before high-intensity work makes sense again. A 3-hour long run takes 48-72 hours. This is why the long run usually anchors the weekend in training schedules, the early-week intensity work gives time for recovery before the next long run.
For runs over 90 minutes, apparel issues compound. Chafing, wet base layers, fabric that holds rain, small problems become significant problems at hour two.
The runners long-run wardrobe priorities:
See the leggings, quarter-zip tops, and hoodies collections for runner-specific pieces.
For most non-elite runners training for general fitness, 60-90 minute long runs build the dominant aerobic adaptations without disproportionate recovery cost. Going longer than 2 hours starts producing diminishing returns unless you are specifically training for a race longer than half marathon.
For marathon training: 28-32 km long runs at easy pace, 1-2 sessions in the peak phase. More distance is not always more adaptation.
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