Why plans differ
Marathon plans set their longest runs in different ways. Some use miles or kilometers; others emphasize duration. They also differ in weekly volume, number of run days, workout content, and the athlete they are designed for. That is why there is no universal number that everyone must complete before race day.
The Boston Athletic Association’s novice plan, for example, includes long runs that reach 16 to 18 miles. It is one official plan among many and reflects its own structure. Use examples like this to understand the range, not to transplant a peak run into a schedule with a different base.
Choose a long run you can absorb
A long run should build endurance and confidence while leaving enough recovery to continue the block. If each long run takes several days to recover from, the distance or effort may be too high for your current capacity. The rest of the week matters too: a long run surrounded by hard sessions can carry more stress than the same run in a well-spaced plan.
Time-based plans can help runners whose paces vary, but time on feet is not automatically safer. Very long outings still create substantial fatigue. Use a plan designed for your experience and avoid chasing a specific distance because other runners report doing it.
- Build the long run gradually instead of adding large jumps.
- Keep most long runs comfortable unless the plan calls for a specific segment.
- Practice fueling and gear on selected long runs.
Do you need to run 26.2 miles in training?
No. A marathon race is not a requirement for a marathon-distance training run. Many established plans top out below the race distance, using the full block and taper to prepare. The longest run is one component among weekly training, long-run frequency, and pacing practice.
If a plan’s longest run seems out of reach or leaves you unusually fatigued, ask a coach to review it. For pain or a return from injury, talk with a clinician before progressing.
Common questions
Is a 20-mile long run necessary?
No single distance is required for every runner. Follow a plan whose progression matches your experience and goals.
Should long runs be at marathon pace?
Most long-run distance is often comfortable, with race-pace segments included only when the plan calls for them.
Sources and further reading
This AI-assisted guide is based on the sources listed above and has not been reviewed by a clinician. It provides general training education, not medical advice, diagnosis, or treatment. If pain changes your stride, persists, or worsens, pause and consult a qualified healthcare professional.