Types of Multiday Events: Formats, Rules, and First-Race Fit

Multiday running includes several formats with very different risk, support, and logistics. Two events with the same advertised duration can differ in terrain, weather exposure, sleep access, crew rules, aid, and the consequences of withdrawing. Always read the current organizer rules before applying general advice.

Timed vs Distance Events

• Fixed-time eventsgive you a duration—commonly 24 hours, 48 hours, or six days—and credit the distance completed under the organizer's timing rules. The clock normally continues during food, foot care, rest, and sleep.
• Fixed-distance events define a route or distance and finish when you reach the endpoint within its cutoffs. Rest usually consumes elapsed time, but aid and sleep rules vary.
• Stage events divide the competition into daily sections, with an overnight period before the next start.

24-Hour Races

A 24-hour event asks runners to cover as much distance as possible in one day. Many use a short track or road loop, which can make navigation, supplies, and crew contact straightforward. Others use longer or trail loops, so the label does not guarantee an easy surface or constant aid.

We recommend no planned sleep in a 24-hour race; take one 20-minute nap only if sleepiness makes you unsafe. Sleepiness peaks in the hours before dawn, when the body clock is lowest. A first-timer with a marathon or 50K behind them should aim for about 100 km. Confusion, repeated stumbling or falling asleep while moving means stop and get assessed.

Read the full 24-hour race guide

48-Hour Races

A second day adds cumulative fatigue and makes sleep, foot care and food variety part of the race. We recommend 1–3 hours of sleep in total, mostly as one 90-minute sleep on the second night, and 160 km (100 miles) as a first target. In 2025 the median runner covered 201 km at Royan and 161 km at Across the Years.

Read the full 48-hour race guide

6-Day Races

Six-day racing has roots in nineteenth-century pedestrian events and remains a recognized multiday discipline. Modern races often use a track or short loop with a support area, but surface, direction changes, accommodation, and crew rules differ.

The format needs a system for pacing, sleep, feet, food and weather that holds for six days. In four 2025 fields the median runner covered 328–523 km. We recommend 400 km as a first target, with 2–4 hours of sleep every night from the first.

Read the full six-day race guide

Stage Races

Stage races split the route into daily segments with defined starts and finishes. The overnight interval changes the challenge, but it does not necessarily make the event easier. Examples range from self-supported desert events, where competitors carry mandatory equipment, to supported mountain traverses with transported luggage.

Compare these details in the rulebook:

• mandatory equipment, food, and water capacity;
• navigation, altitude, technical terrain, and exposure;
• daily and overall cutoffs;
• camp, sleep, medical, and evacuation arrangements;
• whether outside assistance is prohibited.

Backyard Ultras

In the standard backyard format, runners start a 4.167-mile (6.7056 km) loop on the hour. A loop must be completed within that hour and the runner must be present for the next start. The race ends when one runner completes a yard that nobody else completes; that deciding yard may well start with two or three runners on the line, and the winner is simply the only one to finish it. If every remaining runner fails on the same yard, there is no winner and all of them are recorded as DNF with their completed-yard totals.

We recommend running each yard in 50–55 minutes, which leaves 5–10 minutes to eat and sort your feet, and setting 12 yards (80.4 km) as a first target. Check each race's corral, assistance and timing rules before the start.

Read the full backyard ultra guide

Long Continuous Races

Long mountain and road races can keep participants on course across several days even though the goal is a fixed finish rather than a fixed time. Events such as the Moab 240, Bigfoot 200, and Tor des Géants pair multiday sleep and fueling decisions with navigation, elevation, remoteness, variable aid, and cutoffs.

These events are not interchangeable with looped timed races. Course access, required equipment, pacer rules, transport after withdrawal, and emergency response deserve as much attention as distance.

Road, Track, Trail, and Loop

• Short tracks and loops: predictable navigation and frequent access to supplies, with repetitive turns and surfaces.
• Long road loops: more variety and exposure, with aid and crew available only at defined points.
• Trail loops: terrain, elevation, darkness, weather, and navigation can slow access to aid.
• Point-to-point routes: withdrawal and transport may be complex because your base moves farther away.

Surface alone does not determine injury or difficulty. Preparation should match the specific grade, footing, turns, altitude, weather, and equipment rules of the chosen course.

Choosing a First Format

Our recommendation is a 24-hour race on a short loop. The alternatives:

• Choose a short looped timed event for simple navigation, aid every few minutes, and an easy exit. This is our default.
• Choose a stage race if defined daily endpoints appeal and you have the terrain and equipment skills it requires.
• Choose a backyard ultra if you have practiced the exact hourly routine and accept an open-ended finish.
• Delay a remote continuous race until your navigation, night movement, self-care, and emergency planning match the route.