The Eryri (Snowdonia) National Park Authority gives six hours for five of Snowdon’s six paths, and seven hours for the Llanberis Path. It rates every one of them Hard or Strenuous.

Look elsewhere online and you will often see the Miners’ Track quoted at four to five hours, a supposedly quick and easy option. The National Park’s own route pages do not say that.

That gap matters more than it looks. The number that actually decides your day is not the walking time on a route page. It is what time that number forces you to leave the car park.

Most people plan the walk.

Fewer plan the day around it.

The quick answer, route by route

Every figure below is for the walk there and back, not a one-way estimate to the summit.

• Llanberis Path. 14.5 km round trip, the same walk the National Park describes elsewhere as a nine mile day out. 3,199 ft (975 m) of ascent. Allow seven hours. Rated Hard/Strenuous.
• Pyg Track. 11 km round trip. 2,936 ft (895 m) of ascent. Allow six hours. Rated Hard/Strenuous.
• Miners’ Track. 13 km round trip. 2,372 ft (723 m) of ascent. Allow six hours. Rated Hard/Strenuous.
• Watkin Path. 13 km round trip and the biggest climb of the six, at 3,330 ft (1,015 m) of ascent. Allow six hours. Rated Hard/Strenuous.
• Rhyd Ddu Path. 12 km round trip. Allow six hours. Rated Hard/Strenuous. The National Park does not publish an ascent figure for this route.
• Snowdon Ranger Path. 13 km round trip. 3,071 ft (936 m) of ascent. Allow six hours. Rated Hard/Strenuous.

These six numbers assume you already know which path up Snowdon suits your group. If not, that decision comes first.

Whichever path you read a shorter number for, check whether it is quoting a one-way climb. The National Park’s figures never are.

Why your day runs longer than the walking time

The National Park’s hours cover the walk. They rarely cover your actual day.

Ordnance Survey’s own route-planning guidance is blunt about why. Breaks, refreshments and photographs all add time, and the larger the group, the slower it moves.

Add the summit itself.

On a fine day, real time can disappear in the queue at the summit pillar before you even start down. That time never appears in the walking figure.

Then there is the weather.

Snowdonia can turn fast, and stopping twice to add or strip a layer costs real minutes on top of everything else.

Stops, photos, a crowded summit and a mixed-ability group can easily add an hour or more to the National Park’s own number.

How to work out your own time

There is a simple way to estimate your own pace before you compare it with the National Park’s figure.

A Victorian-era Scottish mountaineer named Naismith worked out a rough formula, and Ordnance Survey still uses it as a starting point.

The rule assumes one fit person walking briskly, not a group of mixed ages carrying a picnic.

In metric terms: allow one hour for every five kilometres walked, then add one hour for every 600 metres climbed.

Try it on the Pyg Track.

Eleven kilometres of walking comes to a little over two hours. Climbing 895 metres adds roughly another one and a half hours.

That is well under four hours in total.

The National Park allows six hours for the same route. Naismith’s raw formula falls more than two hours short of what the National Park actually budgets.

Ordnance Survey offers a simpler shortcut too: add ten minutes for every 100 metres you climb, which lands close to the same number.

Ordnance Survey is also candid about the formula’s limits. The rule assumes one fit person walking briskly, not a group of mixed ages carrying a picnic. And it only counts the climb, not the way down.

The descent is not the easy half

That last point matters, because the National Park’s six or seven hours already includes coming back down, not just going up.

Ordnance Survey is rebuilding its own walking-time model. It wants to account for how steep a route is in both directions.

Naismith’s original formula only ever counted the climb.

The reason is practical. Ordnance Survey wants fewer walkers left overdue on the hill after dark. A better estimate can prevent the mountain rescue call-out that follows.

A steep, rocky descent on tired legs takes real time, whatever the ascent figure suggested. Budget for it going down, not just going up.

Working backwards to a start time

Here is the useful version of this whole question. Instead of asking how long the walk takes, ask what time you need to leave.

Start with today’s actual sunset.

Not a number you remember from a previous trip.

Check the Sherpa’r Wyddfa bus timetable for yourself if you are relying on it. The network runs five linked services, S1 to S5, between the main trailheads.

The National Park publishes no fixed times on its own page. Confirm today’s last bus before you set off, not after.

Parking can decide your start time before you have walked a step. The Watkin Path’s Nant Gwynant car park is often full by 7:30am, according to the National Park, and its parking generally is extremely limited. Booking ahead or taking the bus is the National Park’s own advice for that route.

A head torch earns its place in the bag once your working-backwards sums run close to dusk. Packing one and taking a moment to compare head torches on Amazon beats gambling on finishing before the light goes.

Who is slower, and why that’s fine

The National Park says every route on the mountain needs a good level of fitness and solid navigation skills, whichever one you pick.

A first Snowdon, a walk with children, or a large mixed-ability group will all run past the National Park’s own hours. That is completely normal, not a failure to keep up.

Winter changes the arithmetic further. Shorter daylight and harder underfoot conditions both eat into a budget that was already tight in summer.

Slower is not the problem, not planning for it is. Add time honestly rather than assuming your group will match the National Park’s number.

Start in the dark, finish in the light

Work backwards through all of it. Add the walking time, the stops, the descent, the last bus, and a car park that may already be full.

If the sums leave you short on daylight, Ordnance Survey’s own guidance is blunt. Walkers are generally much better off “starting in the dark and finishing in the light” than risking the alternative coming down.

Set off before dawn if the numbers say so. It beats finding out on the descent that you left it too late.