If you've ever asked "how long should long runs be?", the best answer is based on race goal, weekly mileage, and recovery capacity. Longer is not always better. Consistent, absorbable long runs beat occasional hero workouts.
Long-run duration and distance by target race
Use time on feet as your primary cap, then check distance as a secondary guide. Most runners progress better when long runs stay in a recoverable range.
| Target race | Typical long-run duration | Typical distance range | Notes |
|---|---|---|---|
| 5K / 10K | 60-90 min | 6-10 miles (10-16 km) | Build aerobic base without excessive fatigue. |
| Long run for half marathon | 90-120 min | 8-14 miles (13-23 km) | Peak long run often lands around 10-12 miles for many recreational runners. |
| Marathon | 120-180 min | 12-22 miles (19-35 km) | Most plans cap at ~3 hours to limit recovery cost. |
| Ultras (50K+) | 150-300+ min | 16+ miles (26+ km) | Specific terrain and fueling practice become primary goals. |
A practical rule: your long run is often 20-35% of weekly volume. If one run is much bigger than that, injury risk and recovery drag usually rise.
Long run pace: easy vs progression
Your default long run pace should feel conversational. Most long runs are easy aerobic work, not stealth race efforts.
| Long-run type | How hard it feels | Approx guide | Best use |
|---|---|---|---|
| Easy long run | RPE 3-4/10 | ~60-90 sec/mile slower than 10K pace | Most weeks, especially during base blocks. |
| Progression long run | Starts easy, ends moderate (RPE 5-7) | Last 20-40 min around marathon pace to half-marathon effort | Race-specific phase, no more than every 2-3 weeks for most. |
If pace is drifting while effort spikes, slow down. Conditions (heat, hills, wind) should change pace targets, not effort targets.
Fueling thresholds by duration
Fueling needs increase quickly once your run passes 75-90 minutes. Use long runs to rehearse race-day intake.
- Under 60 minutes: Usually water is enough (unless very hot).
- 60-90 minutes: Optional light carbs; useful if intensity is higher or you started under-fueled.
- 90-150 minutes: Aim ~30-60g carbs per hour plus fluid and sodium based on sweat rate.
- 150+ minutes: Often ~60-90g carbs per hour (or individualized higher strategies), with structured hydration and sodium.
Practice exactly what you'll use in races: gel brand, drink concentration, and timing cadence.
Recovery rules and warning signs
Long-run success is measured by the next 48 hours, not by one Strava post. Your next quality session should still be possible.
Simple recovery rules
- Keep most long runs easy enough to finish feeling controlled.
- Eat carbs + protein within 1-2 hours after finishing.
- Protect sleep the night after your long run.
- Use a lighter day after long runs (easy jog, cross-train, or rest).
Warning signs to reduce load
- Persistent pain that changes your stride.
- Heavy fatigue that lasts more than 48 hours.
- Rising resting heart rate, poor sleep, or unusual irritability.
- Repeated inability to hit easy paces at easy effort.
When those signs appear, cut long-run duration for 1-2 weeks and prioritize recovery before rebuilding.
Related tools and guides
- What pace do I need for a 4-hour marathon? for race-specific pace context.
- Marathon taper plan for reducing fatigue near race day.
- Return to running after injury for injury-prevention progressions.
- Sensible exercises for runners for durable hips, calves, and ankles.
- Recovery calculator to estimate post-run recovery needs.